ASTContext.cpp revision 467b27b9a24bdc823218ad1ad0e37673b6cc1e83
1//===--- ASTContext.cpp - Context to hold long-lived AST nodes ------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the ASTContext interface. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/DeclCXX.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/TypeLoc.h" 19#include "clang/AST/Expr.h" 20#include "clang/AST/ExternalASTSource.h" 21#include "clang/AST/RecordLayout.h" 22#include "clang/Basic/Builtins.h" 23#include "clang/Basic/SourceManager.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/ADT/StringExtras.h" 26#include "llvm/Support/MathExtras.h" 27#include "llvm/Support/MemoryBuffer.h" 28#include "RecordLayoutBuilder.h" 29 30using namespace clang; 31 32enum FloatingRank { 33 FloatRank, DoubleRank, LongDoubleRank 34}; 35 36ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 37 TargetInfo &t, 38 IdentifierTable &idents, SelectorTable &sels, 39 Builtin::Context &builtins, 40 bool FreeMem, unsigned size_reserve) : 41 GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0), 42 ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0), 43 sigjmp_bufDecl(0), BlockDescriptorType(0), BlockDescriptorExtendedType(0), 44 SourceMgr(SM), LangOpts(LOpts), 45 LoadedExternalComments(false), FreeMemory(FreeMem), Target(t), 46 Idents(idents), Selectors(sels), 47 BuiltinInfo(builtins), ExternalSource(0), PrintingPolicy(LOpts) { 48 ObjCIdRedefinitionType = QualType(); 49 ObjCClassRedefinitionType = QualType(); 50 if (size_reserve > 0) Types.reserve(size_reserve); 51 TUDecl = TranslationUnitDecl::Create(*this); 52 InitBuiltinTypes(); 53} 54 55ASTContext::~ASTContext() { 56 // Deallocate all the types. 57 while (!Types.empty()) { 58 Types.back()->Destroy(*this); 59 Types.pop_back(); 60 } 61 62 { 63 llvm::FoldingSet<ExtQuals>::iterator 64 I = ExtQualNodes.begin(), E = ExtQualNodes.end(); 65 while (I != E) 66 Deallocate(&*I++); 67 } 68 69 { 70 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 71 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 72 while (I != E) { 73 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 74 delete R; 75 } 76 } 77 78 { 79 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*>::iterator 80 I = ObjCLayouts.begin(), E = ObjCLayouts.end(); 81 while (I != E) { 82 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 83 delete R; 84 } 85 } 86 87 // Destroy nested-name-specifiers. 88 for (llvm::FoldingSet<NestedNameSpecifier>::iterator 89 NNS = NestedNameSpecifiers.begin(), 90 NNSEnd = NestedNameSpecifiers.end(); 91 NNS != NNSEnd; 92 /* Increment in loop */) 93 (*NNS++).Destroy(*this); 94 95 if (GlobalNestedNameSpecifier) 96 GlobalNestedNameSpecifier->Destroy(*this); 97 98 TUDecl->Destroy(*this); 99} 100 101void 102ASTContext::setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source) { 103 ExternalSource.reset(Source.take()); 104} 105 106void ASTContext::PrintStats() const { 107 fprintf(stderr, "*** AST Context Stats:\n"); 108 fprintf(stderr, " %d types total.\n", (int)Types.size()); 109 110 unsigned counts[] = { 111#define TYPE(Name, Parent) 0, 112#define ABSTRACT_TYPE(Name, Parent) 113#include "clang/AST/TypeNodes.def" 114 0 // Extra 115 }; 116 117 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 118 Type *T = Types[i]; 119 counts[(unsigned)T->getTypeClass()]++; 120 } 121 122 unsigned Idx = 0; 123 unsigned TotalBytes = 0; 124#define TYPE(Name, Parent) \ 125 if (counts[Idx]) \ 126 fprintf(stderr, " %d %s types\n", (int)counts[Idx], #Name); \ 127 TotalBytes += counts[Idx] * sizeof(Name##Type); \ 128 ++Idx; 129#define ABSTRACT_TYPE(Name, Parent) 130#include "clang/AST/TypeNodes.def" 131 132 fprintf(stderr, "Total bytes = %d\n", int(TotalBytes)); 133 134 if (ExternalSource.get()) { 135 fprintf(stderr, "\n"); 136 ExternalSource->PrintStats(); 137 } 138} 139 140 141void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 142 BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K); 143 R = QualType(Ty, 0); 144 Types.push_back(Ty); 145} 146 147void ASTContext::InitBuiltinTypes() { 148 assert(VoidTy.isNull() && "Context reinitialized?"); 149 150 // C99 6.2.5p19. 151 InitBuiltinType(VoidTy, BuiltinType::Void); 152 153 // C99 6.2.5p2. 154 InitBuiltinType(BoolTy, BuiltinType::Bool); 155 // C99 6.2.5p3. 156 if (LangOpts.CharIsSigned) 157 InitBuiltinType(CharTy, BuiltinType::Char_S); 158 else 159 InitBuiltinType(CharTy, BuiltinType::Char_U); 160 // C99 6.2.5p4. 161 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 162 InitBuiltinType(ShortTy, BuiltinType::Short); 163 InitBuiltinType(IntTy, BuiltinType::Int); 164 InitBuiltinType(LongTy, BuiltinType::Long); 165 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 166 167 // C99 6.2.5p6. 168 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 169 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 170 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 171 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 172 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 173 174 // C99 6.2.5p10. 175 InitBuiltinType(FloatTy, BuiltinType::Float); 176 InitBuiltinType(DoubleTy, BuiltinType::Double); 177 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 178 179 // GNU extension, 128-bit integers. 180 InitBuiltinType(Int128Ty, BuiltinType::Int128); 181 InitBuiltinType(UnsignedInt128Ty, BuiltinType::UInt128); 182 183 if (LangOpts.CPlusPlus) // C++ 3.9.1p5 184 InitBuiltinType(WCharTy, BuiltinType::WChar); 185 else // C99 186 WCharTy = getFromTargetType(Target.getWCharType()); 187 188 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 189 InitBuiltinType(Char16Ty, BuiltinType::Char16); 190 else // C99 191 Char16Ty = getFromTargetType(Target.getChar16Type()); 192 193 if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++ 194 InitBuiltinType(Char32Ty, BuiltinType::Char32); 195 else // C99 196 Char32Ty = getFromTargetType(Target.getChar32Type()); 197 198 // Placeholder type for functions. 199 InitBuiltinType(OverloadTy, BuiltinType::Overload); 200 201 // Placeholder type for type-dependent expressions whose type is 202 // completely unknown. No code should ever check a type against 203 // DependentTy and users should never see it; however, it is here to 204 // help diagnose failures to properly check for type-dependent 205 // expressions. 206 InitBuiltinType(DependentTy, BuiltinType::Dependent); 207 208 // Placeholder type for C++0x auto declarations whose real type has 209 // not yet been deduced. 210 InitBuiltinType(UndeducedAutoTy, BuiltinType::UndeducedAuto); 211 212 // C99 6.2.5p11. 213 FloatComplexTy = getComplexType(FloatTy); 214 DoubleComplexTy = getComplexType(DoubleTy); 215 LongDoubleComplexTy = getComplexType(LongDoubleTy); 216 217 BuiltinVaListType = QualType(); 218 219 // "Builtin" typedefs set by Sema::ActOnTranslationUnitScope(). 220 ObjCIdTypedefType = QualType(); 221 ObjCClassTypedefType = QualType(); 222 223 // Builtin types for 'id' and 'Class'. 224 InitBuiltinType(ObjCBuiltinIdTy, BuiltinType::ObjCId); 225 InitBuiltinType(ObjCBuiltinClassTy, BuiltinType::ObjCClass); 226 227 ObjCConstantStringType = QualType(); 228 229 // void * type 230 VoidPtrTy = getPointerType(VoidTy); 231 232 // nullptr type (C++0x 2.14.7) 233 InitBuiltinType(NullPtrTy, BuiltinType::NullPtr); 234} 235 236MemberSpecializationInfo * 237ASTContext::getInstantiatedFromStaticDataMember(const VarDecl *Var) { 238 assert(Var->isStaticDataMember() && "Not a static data member"); 239 llvm::DenseMap<const VarDecl *, MemberSpecializationInfo *>::iterator Pos 240 = InstantiatedFromStaticDataMember.find(Var); 241 if (Pos == InstantiatedFromStaticDataMember.end()) 242 return 0; 243 244 return Pos->second; 245} 246 247void 248ASTContext::setInstantiatedFromStaticDataMember(VarDecl *Inst, VarDecl *Tmpl, 249 TemplateSpecializationKind TSK) { 250 assert(Inst->isStaticDataMember() && "Not a static data member"); 251 assert(Tmpl->isStaticDataMember() && "Not a static data member"); 252 assert(!InstantiatedFromStaticDataMember[Inst] && 253 "Already noted what static data member was instantiated from"); 254 InstantiatedFromStaticDataMember[Inst] 255 = new (*this) MemberSpecializationInfo(Tmpl, TSK); 256} 257 258UnresolvedUsingDecl * 259ASTContext::getInstantiatedFromUnresolvedUsingDecl(UsingDecl *UUD) { 260 llvm::DenseMap<UsingDecl *, UnresolvedUsingDecl *>::iterator Pos 261 = InstantiatedFromUnresolvedUsingDecl.find(UUD); 262 if (Pos == InstantiatedFromUnresolvedUsingDecl.end()) 263 return 0; 264 265 return Pos->second; 266} 267 268void 269ASTContext::setInstantiatedFromUnresolvedUsingDecl(UsingDecl *UD, 270 UnresolvedUsingDecl *UUD) { 271 assert(!InstantiatedFromUnresolvedUsingDecl[UD] && 272 "Already noted what using decl what instantiated from"); 273 InstantiatedFromUnresolvedUsingDecl[UD] = UUD; 274} 275 276FieldDecl *ASTContext::getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field) { 277 llvm::DenseMap<FieldDecl *, FieldDecl *>::iterator Pos 278 = InstantiatedFromUnnamedFieldDecl.find(Field); 279 if (Pos == InstantiatedFromUnnamedFieldDecl.end()) 280 return 0; 281 282 return Pos->second; 283} 284 285void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, 286 FieldDecl *Tmpl) { 287 assert(!Inst->getDeclName() && "Instantiated field decl is not unnamed"); 288 assert(!Tmpl->getDeclName() && "Template field decl is not unnamed"); 289 assert(!InstantiatedFromUnnamedFieldDecl[Inst] && 290 "Already noted what unnamed field was instantiated from"); 291 292 InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl; 293} 294 295namespace { 296 class BeforeInTranslationUnit 297 : std::binary_function<SourceRange, SourceRange, bool> { 298 SourceManager *SourceMgr; 299 300 public: 301 explicit BeforeInTranslationUnit(SourceManager *SM) : SourceMgr(SM) { } 302 303 bool operator()(SourceRange X, SourceRange Y) { 304 return SourceMgr->isBeforeInTranslationUnit(X.getBegin(), Y.getBegin()); 305 } 306 }; 307} 308 309/// \brief Determine whether the given comment is a Doxygen-style comment. 310/// 311/// \param Start the start of the comment text. 312/// 313/// \param End the end of the comment text. 314/// 315/// \param Member whether we want to check whether this is a member comment 316/// (which requires a < after the Doxygen-comment delimiter). Otherwise, 317/// we only return true when we find a non-member comment. 318static bool 319isDoxygenComment(SourceManager &SourceMgr, SourceRange Comment, 320 bool Member = false) { 321 const char *BufferStart 322 = SourceMgr.getBufferData(SourceMgr.getFileID(Comment.getBegin())).first; 323 const char *Start = BufferStart + SourceMgr.getFileOffset(Comment.getBegin()); 324 const char* End = BufferStart + SourceMgr.getFileOffset(Comment.getEnd()); 325 326 if (End - Start < 4) 327 return false; 328 329 assert(Start[0] == '/' && "Not a comment?"); 330 if (Start[1] == '*' && !(Start[2] == '!' || Start[2] == '*')) 331 return false; 332 if (Start[1] == '/' && !(Start[2] == '!' || Start[2] == '/')) 333 return false; 334 335 return (Start[3] == '<') == Member; 336} 337 338/// \brief Retrieve the comment associated with the given declaration, if 339/// it has one. 340const char *ASTContext::getCommentForDecl(const Decl *D) { 341 if (!D) 342 return 0; 343 344 // Check whether we have cached a comment string for this declaration 345 // already. 346 llvm::DenseMap<const Decl *, std::string>::iterator Pos 347 = DeclComments.find(D); 348 if (Pos != DeclComments.end()) 349 return Pos->second.c_str(); 350 351 // If we have an external AST source and have not yet loaded comments from 352 // that source, do so now. 353 if (ExternalSource && !LoadedExternalComments) { 354 std::vector<SourceRange> LoadedComments; 355 ExternalSource->ReadComments(LoadedComments); 356 357 if (!LoadedComments.empty()) 358 Comments.insert(Comments.begin(), LoadedComments.begin(), 359 LoadedComments.end()); 360 361 LoadedExternalComments = true; 362 } 363 364 // If there are no comments anywhere, we won't find anything. 365 if (Comments.empty()) 366 return 0; 367 368 // If the declaration doesn't map directly to a location in a file, we 369 // can't find the comment. 370 SourceLocation DeclStartLoc = D->getLocStart(); 371 if (DeclStartLoc.isInvalid() || !DeclStartLoc.isFileID()) 372 return 0; 373 374 // Find the comment that occurs just before this declaration. 375 std::vector<SourceRange>::iterator LastComment 376 = std::lower_bound(Comments.begin(), Comments.end(), 377 SourceRange(DeclStartLoc), 378 BeforeInTranslationUnit(&SourceMgr)); 379 380 // Decompose the location for the start of the declaration and find the 381 // beginning of the file buffer. 382 std::pair<FileID, unsigned> DeclStartDecomp 383 = SourceMgr.getDecomposedLoc(DeclStartLoc); 384 const char *FileBufferStart 385 = SourceMgr.getBufferData(DeclStartDecomp.first).first; 386 387 // First check whether we have a comment for a member. 388 if (LastComment != Comments.end() && 389 !isa<TagDecl>(D) && !isa<NamespaceDecl>(D) && 390 isDoxygenComment(SourceMgr, *LastComment, true)) { 391 std::pair<FileID, unsigned> LastCommentEndDecomp 392 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 393 if (DeclStartDecomp.first == LastCommentEndDecomp.first && 394 SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second) 395 == SourceMgr.getLineNumber(LastCommentEndDecomp.first, 396 LastCommentEndDecomp.second)) { 397 // The Doxygen member comment comes after the declaration starts and 398 // is on the same line and in the same file as the declaration. This 399 // is the comment we want. 400 std::string &Result = DeclComments[D]; 401 Result.append(FileBufferStart + 402 SourceMgr.getFileOffset(LastComment->getBegin()), 403 FileBufferStart + LastCommentEndDecomp.second + 1); 404 return Result.c_str(); 405 } 406 } 407 408 if (LastComment == Comments.begin()) 409 return 0; 410 --LastComment; 411 412 // Decompose the end of the comment. 413 std::pair<FileID, unsigned> LastCommentEndDecomp 414 = SourceMgr.getDecomposedLoc(LastComment->getEnd()); 415 416 // If the comment and the declaration aren't in the same file, then they 417 // aren't related. 418 if (DeclStartDecomp.first != LastCommentEndDecomp.first) 419 return 0; 420 421 // Check that we actually have a Doxygen comment. 422 if (!isDoxygenComment(SourceMgr, *LastComment)) 423 return 0; 424 425 // Compute the starting line for the declaration and for the end of the 426 // comment (this is expensive). 427 unsigned DeclStartLine 428 = SourceMgr.getLineNumber(DeclStartDecomp.first, DeclStartDecomp.second); 429 unsigned CommentEndLine 430 = SourceMgr.getLineNumber(LastCommentEndDecomp.first, 431 LastCommentEndDecomp.second); 432 433 // If the comment does not end on the line prior to the declaration, then 434 // the comment is not associated with the declaration at all. 435 if (CommentEndLine + 1 != DeclStartLine) 436 return 0; 437 438 // We have a comment, but there may be more comments on the previous lines. 439 // Keep looking so long as the comments are still Doxygen comments and are 440 // still adjacent. 441 unsigned ExpectedLine 442 = SourceMgr.getSpellingLineNumber(LastComment->getBegin()) - 1; 443 std::vector<SourceRange>::iterator FirstComment = LastComment; 444 while (FirstComment != Comments.begin()) { 445 // Look at the previous comment 446 --FirstComment; 447 std::pair<FileID, unsigned> Decomp 448 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 449 450 // If this previous comment is in a different file, we're done. 451 if (Decomp.first != DeclStartDecomp.first) { 452 ++FirstComment; 453 break; 454 } 455 456 // If this comment is not a Doxygen comment, we're done. 457 if (!isDoxygenComment(SourceMgr, *FirstComment)) { 458 ++FirstComment; 459 break; 460 } 461 462 // If the line number is not what we expected, we're done. 463 unsigned Line = SourceMgr.getLineNumber(Decomp.first, Decomp.second); 464 if (Line != ExpectedLine) { 465 ++FirstComment; 466 break; 467 } 468 469 // Set the next expected line number. 470 ExpectedLine 471 = SourceMgr.getSpellingLineNumber(FirstComment->getBegin()) - 1; 472 } 473 474 // The iterator range [FirstComment, LastComment] contains all of the 475 // BCPL comments that, together, are associated with this declaration. 476 // Form a single comment block string for this declaration that concatenates 477 // all of these comments. 478 std::string &Result = DeclComments[D]; 479 while (FirstComment != LastComment) { 480 std::pair<FileID, unsigned> DecompStart 481 = SourceMgr.getDecomposedLoc(FirstComment->getBegin()); 482 std::pair<FileID, unsigned> DecompEnd 483 = SourceMgr.getDecomposedLoc(FirstComment->getEnd()); 484 Result.append(FileBufferStart + DecompStart.second, 485 FileBufferStart + DecompEnd.second + 1); 486 ++FirstComment; 487 } 488 489 // Append the last comment line. 490 Result.append(FileBufferStart + 491 SourceMgr.getFileOffset(LastComment->getBegin()), 492 FileBufferStart + LastCommentEndDecomp.second + 1); 493 return Result.c_str(); 494} 495 496//===----------------------------------------------------------------------===// 497// Type Sizing and Analysis 498//===----------------------------------------------------------------------===// 499 500/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 501/// scalar floating point type. 502const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 503 const BuiltinType *BT = T->getAs<BuiltinType>(); 504 assert(BT && "Not a floating point type!"); 505 switch (BT->getKind()) { 506 default: assert(0 && "Not a floating point type!"); 507 case BuiltinType::Float: return Target.getFloatFormat(); 508 case BuiltinType::Double: return Target.getDoubleFormat(); 509 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 510 } 511} 512 513/// getDeclAlignInBytes - Return a conservative estimate of the alignment of the 514/// specified decl. Note that bitfields do not have a valid alignment, so 515/// this method will assert on them. 516unsigned ASTContext::getDeclAlignInBytes(const Decl *D) { 517 unsigned Align = Target.getCharWidth(); 518 519 if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) 520 Align = std::max(Align, AA->getAlignment()); 521 522 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 523 QualType T = VD->getType(); 524 if (const ReferenceType* RT = T->getAs<ReferenceType>()) { 525 unsigned AS = RT->getPointeeType().getAddressSpace(); 526 Align = Target.getPointerAlign(AS); 527 } else if (!T->isIncompleteType() && !T->isFunctionType()) { 528 // Incomplete or function types default to 1. 529 while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T)) 530 T = cast<ArrayType>(T)->getElementType(); 531 532 Align = std::max(Align, getPreferredTypeAlign(T.getTypePtr())); 533 } 534 } 535 536 return Align / Target.getCharWidth(); 537} 538 539/// getTypeSize - Return the size of the specified type, in bits. This method 540/// does not work on incomplete types. 541/// 542/// FIXME: Pointers into different addr spaces could have different sizes and 543/// alignment requirements: getPointerInfo should take an AddrSpace, this 544/// should take a QualType, &c. 545std::pair<uint64_t, unsigned> 546ASTContext::getTypeInfo(const Type *T) { 547 uint64_t Width=0; 548 unsigned Align=8; 549 switch (T->getTypeClass()) { 550#define TYPE(Class, Base) 551#define ABSTRACT_TYPE(Class, Base) 552#define NON_CANONICAL_TYPE(Class, Base) 553#define DEPENDENT_TYPE(Class, Base) case Type::Class: 554#include "clang/AST/TypeNodes.def" 555 assert(false && "Should not see dependent types"); 556 break; 557 558 case Type::ObjCProtocolList: 559 assert(false && "Should not see protocol list types"); 560 break; 561 562 case Type::FunctionNoProto: 563 case Type::FunctionProto: 564 // GCC extension: alignof(function) = 32 bits 565 Width = 0; 566 Align = 32; 567 break; 568 569 case Type::IncompleteArray: 570 case Type::VariableArray: 571 Width = 0; 572 Align = getTypeAlign(cast<ArrayType>(T)->getElementType()); 573 break; 574 575 case Type::ConstantArray: { 576 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 577 578 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 579 Width = EltInfo.first*CAT->getSize().getZExtValue(); 580 Align = EltInfo.second; 581 break; 582 } 583 case Type::ExtVector: 584 case Type::Vector: { 585 const VectorType *VT = cast<VectorType>(T); 586 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(VT->getElementType()); 587 Width = EltInfo.first*VT->getNumElements(); 588 Align = Width; 589 // If the alignment is not a power of 2, round up to the next power of 2. 590 // This happens for non-power-of-2 length vectors. 591 if (VT->getNumElements() & (VT->getNumElements()-1)) { 592 Align = llvm::NextPowerOf2(Align); 593 Width = llvm::RoundUpToAlignment(Width, Align); 594 } 595 break; 596 } 597 598 case Type::Builtin: 599 switch (cast<BuiltinType>(T)->getKind()) { 600 default: assert(0 && "Unknown builtin type!"); 601 case BuiltinType::Void: 602 // GCC extension: alignof(void) = 8 bits. 603 Width = 0; 604 Align = 8; 605 break; 606 607 case BuiltinType::Bool: 608 Width = Target.getBoolWidth(); 609 Align = Target.getBoolAlign(); 610 break; 611 case BuiltinType::Char_S: 612 case BuiltinType::Char_U: 613 case BuiltinType::UChar: 614 case BuiltinType::SChar: 615 Width = Target.getCharWidth(); 616 Align = Target.getCharAlign(); 617 break; 618 case BuiltinType::WChar: 619 Width = Target.getWCharWidth(); 620 Align = Target.getWCharAlign(); 621 break; 622 case BuiltinType::Char16: 623 Width = Target.getChar16Width(); 624 Align = Target.getChar16Align(); 625 break; 626 case BuiltinType::Char32: 627 Width = Target.getChar32Width(); 628 Align = Target.getChar32Align(); 629 break; 630 case BuiltinType::UShort: 631 case BuiltinType::Short: 632 Width = Target.getShortWidth(); 633 Align = Target.getShortAlign(); 634 break; 635 case BuiltinType::UInt: 636 case BuiltinType::Int: 637 Width = Target.getIntWidth(); 638 Align = Target.getIntAlign(); 639 break; 640 case BuiltinType::ULong: 641 case BuiltinType::Long: 642 Width = Target.getLongWidth(); 643 Align = Target.getLongAlign(); 644 break; 645 case BuiltinType::ULongLong: 646 case BuiltinType::LongLong: 647 Width = Target.getLongLongWidth(); 648 Align = Target.getLongLongAlign(); 649 break; 650 case BuiltinType::Int128: 651 case BuiltinType::UInt128: 652 Width = 128; 653 Align = 128; // int128_t is 128-bit aligned on all targets. 654 break; 655 case BuiltinType::Float: 656 Width = Target.getFloatWidth(); 657 Align = Target.getFloatAlign(); 658 break; 659 case BuiltinType::Double: 660 Width = Target.getDoubleWidth(); 661 Align = Target.getDoubleAlign(); 662 break; 663 case BuiltinType::LongDouble: 664 Width = Target.getLongDoubleWidth(); 665 Align = Target.getLongDoubleAlign(); 666 break; 667 case BuiltinType::NullPtr: 668 Width = Target.getPointerWidth(0); // C++ 3.9.1p11: sizeof(nullptr_t) 669 Align = Target.getPointerAlign(0); // == sizeof(void*) 670 break; 671 } 672 break; 673 case Type::FixedWidthInt: 674 // FIXME: This isn't precisely correct; the width/alignment should depend 675 // on the available types for the target 676 Width = cast<FixedWidthIntType>(T)->getWidth(); 677 Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8); 678 Align = Width; 679 break; 680 case Type::ObjCObjectPointer: 681 Width = Target.getPointerWidth(0); 682 Align = Target.getPointerAlign(0); 683 break; 684 case Type::BlockPointer: { 685 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 686 Width = Target.getPointerWidth(AS); 687 Align = Target.getPointerAlign(AS); 688 break; 689 } 690 case Type::Pointer: { 691 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 692 Width = Target.getPointerWidth(AS); 693 Align = Target.getPointerAlign(AS); 694 break; 695 } 696 case Type::LValueReference: 697 case Type::RValueReference: 698 // "When applied to a reference or a reference type, the result is the size 699 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 700 // FIXME: This is wrong for struct layout: a reference in a struct has 701 // pointer size. 702 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 703 case Type::MemberPointer: { 704 // FIXME: This is ABI dependent. We use the Itanium C++ ABI. 705 // http://www.codesourcery.com/public/cxx-abi/abi.html#member-pointers 706 // If we ever want to support other ABIs this needs to be abstracted. 707 708 QualType Pointee = cast<MemberPointerType>(T)->getPointeeType(); 709 std::pair<uint64_t, unsigned> PtrDiffInfo = 710 getTypeInfo(getPointerDiffType()); 711 Width = PtrDiffInfo.first; 712 if (Pointee->isFunctionType()) 713 Width *= 2; 714 Align = PtrDiffInfo.second; 715 break; 716 } 717 case Type::Complex: { 718 // Complex types have the same alignment as their elements, but twice the 719 // size. 720 std::pair<uint64_t, unsigned> EltInfo = 721 getTypeInfo(cast<ComplexType>(T)->getElementType()); 722 Width = EltInfo.first*2; 723 Align = EltInfo.second; 724 break; 725 } 726 case Type::ObjCInterface: { 727 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 728 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 729 Width = Layout.getSize(); 730 Align = Layout.getAlignment(); 731 break; 732 } 733 case Type::Record: 734 case Type::Enum: { 735 const TagType *TT = cast<TagType>(T); 736 737 if (TT->getDecl()->isInvalidDecl()) { 738 Width = 1; 739 Align = 1; 740 break; 741 } 742 743 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 744 return getTypeInfo(ET->getDecl()->getIntegerType()); 745 746 const RecordType *RT = cast<RecordType>(TT); 747 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 748 Width = Layout.getSize(); 749 Align = Layout.getAlignment(); 750 break; 751 } 752 753 case Type::SubstTemplateTypeParm: 754 return getTypeInfo(cast<SubstTemplateTypeParmType>(T)-> 755 getReplacementType().getTypePtr()); 756 757 case Type::Elaborated: 758 return getTypeInfo(cast<ElaboratedType>(T)->getUnderlyingType() 759 .getTypePtr()); 760 761 case Type::Typedef: { 762 const TypedefDecl *Typedef = cast<TypedefType>(T)->getDecl(); 763 if (const AlignedAttr *Aligned = Typedef->getAttr<AlignedAttr>()) { 764 Align = Aligned->getAlignment(); 765 Width = getTypeSize(Typedef->getUnderlyingType().getTypePtr()); 766 } else 767 return getTypeInfo(Typedef->getUnderlyingType().getTypePtr()); 768 break; 769 } 770 771 case Type::TypeOfExpr: 772 return getTypeInfo(cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType() 773 .getTypePtr()); 774 775 case Type::TypeOf: 776 return getTypeInfo(cast<TypeOfType>(T)->getUnderlyingType().getTypePtr()); 777 778 case Type::Decltype: 779 return getTypeInfo(cast<DecltypeType>(T)->getUnderlyingExpr()->getType() 780 .getTypePtr()); 781 782 case Type::QualifiedName: 783 return getTypeInfo(cast<QualifiedNameType>(T)->getNamedType().getTypePtr()); 784 785 case Type::TemplateSpecialization: 786 assert(getCanonicalType(T) != T && 787 "Cannot request the size of a dependent type"); 788 // FIXME: this is likely to be wrong once we support template 789 // aliases, since a template alias could refer to a typedef that 790 // has an __aligned__ attribute on it. 791 return getTypeInfo(getCanonicalType(T)); 792 } 793 794 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 795 return std::make_pair(Width, Align); 796} 797 798/// getPreferredTypeAlign - Return the "preferred" alignment of the specified 799/// type for the current target in bits. This can be different than the ABI 800/// alignment in cases where it is beneficial for performance to overalign 801/// a data type. 802unsigned ASTContext::getPreferredTypeAlign(const Type *T) { 803 unsigned ABIAlign = getTypeAlign(T); 804 805 // Double and long long should be naturally aligned if possible. 806 if (const ComplexType* CT = T->getAs<ComplexType>()) 807 T = CT->getElementType().getTypePtr(); 808 if (T->isSpecificBuiltinType(BuiltinType::Double) || 809 T->isSpecificBuiltinType(BuiltinType::LongLong)) 810 return std::max(ABIAlign, (unsigned)getTypeSize(T)); 811 812 return ABIAlign; 813} 814 815static void CollectLocalObjCIvars(ASTContext *Ctx, 816 const ObjCInterfaceDecl *OI, 817 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 818 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 819 E = OI->ivar_end(); I != E; ++I) { 820 ObjCIvarDecl *IVDecl = *I; 821 if (!IVDecl->isInvalidDecl()) 822 Fields.push_back(cast<FieldDecl>(IVDecl)); 823 } 824} 825 826void ASTContext::CollectObjCIvars(const ObjCInterfaceDecl *OI, 827 llvm::SmallVectorImpl<FieldDecl*> &Fields) { 828 if (const ObjCInterfaceDecl *SuperClass = OI->getSuperClass()) 829 CollectObjCIvars(SuperClass, Fields); 830 CollectLocalObjCIvars(this, OI, Fields); 831} 832 833/// ShallowCollectObjCIvars - 834/// Collect all ivars, including those synthesized, in the current class. 835/// 836void ASTContext::ShallowCollectObjCIvars(const ObjCInterfaceDecl *OI, 837 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars, 838 bool CollectSynthesized) { 839 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 840 E = OI->ivar_end(); I != E; ++I) { 841 Ivars.push_back(*I); 842 } 843 if (CollectSynthesized) 844 CollectSynthesizedIvars(OI, Ivars); 845} 846 847void ASTContext::CollectProtocolSynthesizedIvars(const ObjCProtocolDecl *PD, 848 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 849 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 850 E = PD->prop_end(); I != E; ++I) 851 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 852 Ivars.push_back(Ivar); 853 854 // Also look into nested protocols. 855 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 856 E = PD->protocol_end(); P != E; ++P) 857 CollectProtocolSynthesizedIvars(*P, Ivars); 858} 859 860/// CollectSynthesizedIvars - 861/// This routine collect synthesized ivars for the designated class. 862/// 863void ASTContext::CollectSynthesizedIvars(const ObjCInterfaceDecl *OI, 864 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 865 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 866 E = OI->prop_end(); I != E; ++I) { 867 if (ObjCIvarDecl *Ivar = (*I)->getPropertyIvarDecl()) 868 Ivars.push_back(Ivar); 869 } 870 // Also look into interface's protocol list for properties declared 871 // in the protocol and whose ivars are synthesized. 872 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 873 PE = OI->protocol_end(); P != PE; ++P) { 874 ObjCProtocolDecl *PD = (*P); 875 CollectProtocolSynthesizedIvars(PD, Ivars); 876 } 877} 878 879unsigned ASTContext::CountProtocolSynthesizedIvars(const ObjCProtocolDecl *PD) { 880 unsigned count = 0; 881 for (ObjCContainerDecl::prop_iterator I = PD->prop_begin(), 882 E = PD->prop_end(); I != E; ++I) 883 if ((*I)->getPropertyIvarDecl()) 884 ++count; 885 886 // Also look into nested protocols. 887 for (ObjCProtocolDecl::protocol_iterator P = PD->protocol_begin(), 888 E = PD->protocol_end(); P != E; ++P) 889 count += CountProtocolSynthesizedIvars(*P); 890 return count; 891} 892 893unsigned ASTContext::CountSynthesizedIvars(const ObjCInterfaceDecl *OI) { 894 unsigned count = 0; 895 for (ObjCInterfaceDecl::prop_iterator I = OI->prop_begin(), 896 E = OI->prop_end(); I != E; ++I) { 897 if ((*I)->getPropertyIvarDecl()) 898 ++count; 899 } 900 // Also look into interface's protocol list for properties declared 901 // in the protocol and whose ivars are synthesized. 902 for (ObjCInterfaceDecl::protocol_iterator P = OI->protocol_begin(), 903 PE = OI->protocol_end(); P != PE; ++P) { 904 ObjCProtocolDecl *PD = (*P); 905 count += CountProtocolSynthesizedIvars(PD); 906 } 907 return count; 908} 909 910/// \brief Get the implementation of ObjCInterfaceDecl,or NULL if none exists. 911ObjCImplementationDecl *ASTContext::getObjCImplementation(ObjCInterfaceDecl *D) { 912 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 913 I = ObjCImpls.find(D); 914 if (I != ObjCImpls.end()) 915 return cast<ObjCImplementationDecl>(I->second); 916 return 0; 917} 918/// \brief Get the implementation of ObjCCategoryDecl, or NULL if none exists. 919ObjCCategoryImplDecl *ASTContext::getObjCImplementation(ObjCCategoryDecl *D) { 920 llvm::DenseMap<ObjCContainerDecl*, ObjCImplDecl*>::iterator 921 I = ObjCImpls.find(D); 922 if (I != ObjCImpls.end()) 923 return cast<ObjCCategoryImplDecl>(I->second); 924 return 0; 925} 926 927/// \brief Set the implementation of ObjCInterfaceDecl. 928void ASTContext::setObjCImplementation(ObjCInterfaceDecl *IFaceD, 929 ObjCImplementationDecl *ImplD) { 930 assert(IFaceD && ImplD && "Passed null params"); 931 ObjCImpls[IFaceD] = ImplD; 932} 933/// \brief Set the implementation of ObjCCategoryDecl. 934void ASTContext::setObjCImplementation(ObjCCategoryDecl *CatD, 935 ObjCCategoryImplDecl *ImplD) { 936 assert(CatD && ImplD && "Passed null params"); 937 ObjCImpls[CatD] = ImplD; 938} 939 940/// \brief Allocate an uninitialized DeclaratorInfo. 941/// 942/// The caller should initialize the memory held by DeclaratorInfo using 943/// the TypeLoc wrappers. 944/// 945/// \param T the type that will be the basis for type source info. This type 946/// should refer to how the declarator was written in source code, not to 947/// what type semantic analysis resolved the declarator to. 948DeclaratorInfo *ASTContext::CreateDeclaratorInfo(QualType T, 949 unsigned DataSize) { 950 if (!DataSize) 951 DataSize = TypeLoc::getFullDataSizeForType(T); 952 else 953 assert(DataSize == TypeLoc::getFullDataSizeForType(T) && 954 "incorrect data size provided to CreateDeclaratorInfo!"); 955 956 DeclaratorInfo *DInfo = 957 (DeclaratorInfo*)BumpAlloc.Allocate(sizeof(DeclaratorInfo) + DataSize, 8); 958 new (DInfo) DeclaratorInfo(T); 959 return DInfo; 960} 961 962/// getInterfaceLayoutImpl - Get or compute information about the 963/// layout of the given interface. 964/// 965/// \param Impl - If given, also include the layout of the interface's 966/// implementation. This may differ by including synthesized ivars. 967const ASTRecordLayout & 968ASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 969 const ObjCImplementationDecl *Impl) { 970 assert(!D->isForwardDecl() && "Invalid interface decl!"); 971 972 // Look up this layout, if already laid out, return what we have. 973 ObjCContainerDecl *Key = 974 Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 975 if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 976 return *Entry; 977 978 // Add in synthesized ivar count if laying out an implementation. 979 if (Impl) { 980 unsigned FieldCount = D->ivar_size(); 981 unsigned SynthCount = CountSynthesizedIvars(D); 982 FieldCount += SynthCount; 983 // If there aren't any sythesized ivars then reuse the interface 984 // entry. Note we can't cache this because we simply free all 985 // entries later; however we shouldn't look up implementations 986 // frequently. 987 if (SynthCount == 0) 988 return getObjCLayout(D, 0); 989 } 990 991 const ASTRecordLayout *NewEntry = 992 ASTRecordLayoutBuilder::ComputeLayout(*this, D, Impl); 993 ObjCLayouts[Key] = NewEntry; 994 995 return *NewEntry; 996} 997 998const ASTRecordLayout & 999ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 1000 return getObjCLayout(D, 0); 1001} 1002 1003const ASTRecordLayout & 1004ASTContext::getASTObjCImplementationLayout(const ObjCImplementationDecl *D) { 1005 return getObjCLayout(D->getClassInterface(), D); 1006} 1007 1008/// getASTRecordLayout - Get or compute information about the layout of the 1009/// specified record (struct/union/class), which indicates its size and field 1010/// position information. 1011const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 1012 D = D->getDefinition(*this); 1013 assert(D && "Cannot get layout of forward declarations!"); 1014 1015 // Look up this layout, if already laid out, return what we have. 1016 // Note that we can't save a reference to the entry because this function 1017 // is recursive. 1018 const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 1019 if (Entry) return *Entry; 1020 1021 const ASTRecordLayout *NewEntry = 1022 ASTRecordLayoutBuilder::ComputeLayout(*this, D); 1023 ASTRecordLayouts[D] = NewEntry; 1024 1025 return *NewEntry; 1026} 1027 1028//===----------------------------------------------------------------------===// 1029// Type creation/memoization methods 1030//===----------------------------------------------------------------------===// 1031 1032QualType ASTContext::getExtQualType(const Type *TypeNode, Qualifiers Quals) { 1033 unsigned Fast = Quals.getFastQualifiers(); 1034 Quals.removeFastQualifiers(); 1035 1036 // Check if we've already instantiated this type. 1037 llvm::FoldingSetNodeID ID; 1038 ExtQuals::Profile(ID, TypeNode, Quals); 1039 void *InsertPos = 0; 1040 if (ExtQuals *EQ = ExtQualNodes.FindNodeOrInsertPos(ID, InsertPos)) { 1041 assert(EQ->getQualifiers() == Quals); 1042 QualType T = QualType(EQ, Fast); 1043 return T; 1044 } 1045 1046 ExtQuals *New = new (*this, TypeAlignment) ExtQuals(*this, TypeNode, Quals); 1047 ExtQualNodes.InsertNode(New, InsertPos); 1048 QualType T = QualType(New, Fast); 1049 return T; 1050} 1051 1052QualType ASTContext::getVolatileType(QualType T) { 1053 QualType CanT = getCanonicalType(T); 1054 if (CanT.isVolatileQualified()) return T; 1055 1056 QualifierCollector Quals; 1057 const Type *TypeNode = Quals.strip(T); 1058 Quals.addVolatile(); 1059 1060 return getExtQualType(TypeNode, Quals); 1061} 1062 1063QualType ASTContext::getAddrSpaceQualType(QualType T, unsigned AddressSpace) { 1064 QualType CanT = getCanonicalType(T); 1065 if (CanT.getAddressSpace() == AddressSpace) 1066 return T; 1067 1068 // If we are composing extended qualifiers together, merge together 1069 // into one ExtQuals node. 1070 QualifierCollector Quals; 1071 const Type *TypeNode = Quals.strip(T); 1072 1073 // If this type already has an address space specified, it cannot get 1074 // another one. 1075 assert(!Quals.hasAddressSpace() && 1076 "Type cannot be in multiple addr spaces!"); 1077 Quals.addAddressSpace(AddressSpace); 1078 1079 return getExtQualType(TypeNode, Quals); 1080} 1081 1082QualType ASTContext::getObjCGCQualType(QualType T, 1083 Qualifiers::GC GCAttr) { 1084 QualType CanT = getCanonicalType(T); 1085 if (CanT.getObjCGCAttr() == GCAttr) 1086 return T; 1087 1088 if (T->isPointerType()) { 1089 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1090 if (Pointee->isAnyPointerType()) { 1091 QualType ResultType = getObjCGCQualType(Pointee, GCAttr); 1092 return getPointerType(ResultType); 1093 } 1094 } 1095 1096 // If we are composing extended qualifiers together, merge together 1097 // into one ExtQuals node. 1098 QualifierCollector Quals; 1099 const Type *TypeNode = Quals.strip(T); 1100 1101 // If this type already has an ObjCGC specified, it cannot get 1102 // another one. 1103 assert(!Quals.hasObjCGCAttr() && 1104 "Type cannot have multiple ObjCGCs!"); 1105 Quals.addObjCGCAttr(GCAttr); 1106 1107 return getExtQualType(TypeNode, Quals); 1108} 1109 1110QualType ASTContext::getNoReturnType(QualType T) { 1111 QualType ResultType; 1112 if (T->isPointerType()) { 1113 QualType Pointee = T->getAs<PointerType>()->getPointeeType(); 1114 ResultType = getNoReturnType(Pointee); 1115 ResultType = getPointerType(ResultType); 1116 } else if (T->isBlockPointerType()) { 1117 QualType Pointee = T->getAs<BlockPointerType>()->getPointeeType(); 1118 ResultType = getNoReturnType(Pointee); 1119 ResultType = getBlockPointerType(ResultType); 1120 } else { 1121 assert (T->isFunctionType() 1122 && "can't noreturn qualify non-pointer to function or block type"); 1123 1124 if (const FunctionNoProtoType *FNPT = T->getAs<FunctionNoProtoType>()) { 1125 ResultType = getFunctionNoProtoType(FNPT->getResultType(), true); 1126 } else { 1127 const FunctionProtoType *F = T->getAs<FunctionProtoType>(); 1128 ResultType 1129 = getFunctionType(F->getResultType(), F->arg_type_begin(), 1130 F->getNumArgs(), F->isVariadic(), F->getTypeQuals(), 1131 F->hasExceptionSpec(), F->hasAnyExceptionSpec(), 1132 F->getNumExceptions(), F->exception_begin(), true); 1133 } 1134 } 1135 1136 return getQualifiedType(ResultType, T.getQualifiers()); 1137} 1138 1139/// getComplexType - Return the uniqued reference to the type for a complex 1140/// number with the specified element type. 1141QualType ASTContext::getComplexType(QualType T) { 1142 // Unique pointers, to guarantee there is only one pointer of a particular 1143 // structure. 1144 llvm::FoldingSetNodeID ID; 1145 ComplexType::Profile(ID, T); 1146 1147 void *InsertPos = 0; 1148 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 1149 return QualType(CT, 0); 1150 1151 // If the pointee type isn't canonical, this won't be a canonical type either, 1152 // so fill in the canonical type field. 1153 QualType Canonical; 1154 if (!T.isCanonical()) { 1155 Canonical = getComplexType(getCanonicalType(T)); 1156 1157 // Get the new insert position for the node we care about. 1158 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 1159 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1160 } 1161 ComplexType *New = new (*this, TypeAlignment) ComplexType(T, Canonical); 1162 Types.push_back(New); 1163 ComplexTypes.InsertNode(New, InsertPos); 1164 return QualType(New, 0); 1165} 1166 1167QualType ASTContext::getFixedWidthIntType(unsigned Width, bool Signed) { 1168 llvm::DenseMap<unsigned, FixedWidthIntType*> &Map = Signed ? 1169 SignedFixedWidthIntTypes : UnsignedFixedWidthIntTypes; 1170 FixedWidthIntType *&Entry = Map[Width]; 1171 if (!Entry) 1172 Entry = new FixedWidthIntType(Width, Signed); 1173 return QualType(Entry, 0); 1174} 1175 1176/// getPointerType - Return the uniqued reference to the type for a pointer to 1177/// the specified type. 1178QualType ASTContext::getPointerType(QualType T) { 1179 // Unique pointers, to guarantee there is only one pointer of a particular 1180 // structure. 1181 llvm::FoldingSetNodeID ID; 1182 PointerType::Profile(ID, T); 1183 1184 void *InsertPos = 0; 1185 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1186 return QualType(PT, 0); 1187 1188 // If the pointee type isn't canonical, this won't be a canonical type either, 1189 // so fill in the canonical type field. 1190 QualType Canonical; 1191 if (!T.isCanonical()) { 1192 Canonical = getPointerType(getCanonicalType(T)); 1193 1194 // Get the new insert position for the node we care about. 1195 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1196 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1197 } 1198 PointerType *New = new (*this, TypeAlignment) PointerType(T, Canonical); 1199 Types.push_back(New); 1200 PointerTypes.InsertNode(New, InsertPos); 1201 return QualType(New, 0); 1202} 1203 1204/// getBlockPointerType - Return the uniqued reference to the type for 1205/// a pointer to the specified block. 1206QualType ASTContext::getBlockPointerType(QualType T) { 1207 assert(T->isFunctionType() && "block of function types only"); 1208 // Unique pointers, to guarantee there is only one block of a particular 1209 // structure. 1210 llvm::FoldingSetNodeID ID; 1211 BlockPointerType::Profile(ID, T); 1212 1213 void *InsertPos = 0; 1214 if (BlockPointerType *PT = 1215 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1216 return QualType(PT, 0); 1217 1218 // If the block pointee type isn't canonical, this won't be a canonical 1219 // type either so fill in the canonical type field. 1220 QualType Canonical; 1221 if (!T.isCanonical()) { 1222 Canonical = getBlockPointerType(getCanonicalType(T)); 1223 1224 // Get the new insert position for the node we care about. 1225 BlockPointerType *NewIP = 1226 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1227 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1228 } 1229 BlockPointerType *New 1230 = new (*this, TypeAlignment) BlockPointerType(T, Canonical); 1231 Types.push_back(New); 1232 BlockPointerTypes.InsertNode(New, InsertPos); 1233 return QualType(New, 0); 1234} 1235 1236/// getLValueReferenceType - Return the uniqued reference to the type for an 1237/// lvalue reference to the specified type. 1238QualType ASTContext::getLValueReferenceType(QualType T) { 1239 // Unique pointers, to guarantee there is only one pointer of a particular 1240 // structure. 1241 llvm::FoldingSetNodeID ID; 1242 ReferenceType::Profile(ID, T); 1243 1244 void *InsertPos = 0; 1245 if (LValueReferenceType *RT = 1246 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1247 return QualType(RT, 0); 1248 1249 // If the referencee type isn't canonical, this won't be a canonical type 1250 // either, so fill in the canonical type field. 1251 QualType Canonical; 1252 if (!T.isCanonical()) { 1253 Canonical = getLValueReferenceType(getCanonicalType(T)); 1254 1255 // Get the new insert position for the node we care about. 1256 LValueReferenceType *NewIP = 1257 LValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1258 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1259 } 1260 1261 LValueReferenceType *New 1262 = new (*this, TypeAlignment) LValueReferenceType(T, Canonical); 1263 Types.push_back(New); 1264 LValueReferenceTypes.InsertNode(New, InsertPos); 1265 return QualType(New, 0); 1266} 1267 1268/// getRValueReferenceType - Return the uniqued reference to the type for an 1269/// rvalue reference to the specified type. 1270QualType ASTContext::getRValueReferenceType(QualType T) { 1271 // Unique pointers, to guarantee there is only one pointer of a particular 1272 // structure. 1273 llvm::FoldingSetNodeID ID; 1274 ReferenceType::Profile(ID, T); 1275 1276 void *InsertPos = 0; 1277 if (RValueReferenceType *RT = 1278 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1279 return QualType(RT, 0); 1280 1281 // If the referencee type isn't canonical, this won't be a canonical type 1282 // either, so fill in the canonical type field. 1283 QualType Canonical; 1284 if (!T.isCanonical()) { 1285 Canonical = getRValueReferenceType(getCanonicalType(T)); 1286 1287 // Get the new insert position for the node we care about. 1288 RValueReferenceType *NewIP = 1289 RValueReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 1290 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1291 } 1292 1293 RValueReferenceType *New 1294 = new (*this, TypeAlignment) RValueReferenceType(T, Canonical); 1295 Types.push_back(New); 1296 RValueReferenceTypes.InsertNode(New, InsertPos); 1297 return QualType(New, 0); 1298} 1299 1300/// getMemberPointerType - Return the uniqued reference to the type for a 1301/// member pointer to the specified type, in the specified class. 1302QualType ASTContext::getMemberPointerType(QualType T, const Type *Cls) { 1303 // Unique pointers, to guarantee there is only one pointer of a particular 1304 // structure. 1305 llvm::FoldingSetNodeID ID; 1306 MemberPointerType::Profile(ID, T, Cls); 1307 1308 void *InsertPos = 0; 1309 if (MemberPointerType *PT = 1310 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1311 return QualType(PT, 0); 1312 1313 // If the pointee or class type isn't canonical, this won't be a canonical 1314 // type either, so fill in the canonical type field. 1315 QualType Canonical; 1316 if (!T.isCanonical()) { 1317 Canonical = getMemberPointerType(getCanonicalType(T),getCanonicalType(Cls)); 1318 1319 // Get the new insert position for the node we care about. 1320 MemberPointerType *NewIP = 1321 MemberPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 1322 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1323 } 1324 MemberPointerType *New 1325 = new (*this, TypeAlignment) MemberPointerType(T, Cls, Canonical); 1326 Types.push_back(New); 1327 MemberPointerTypes.InsertNode(New, InsertPos); 1328 return QualType(New, 0); 1329} 1330 1331/// getConstantArrayType - Return the unique reference to the type for an 1332/// array of the specified element type. 1333QualType ASTContext::getConstantArrayType(QualType EltTy, 1334 const llvm::APInt &ArySizeIn, 1335 ArrayType::ArraySizeModifier ASM, 1336 unsigned EltTypeQuals) { 1337 assert((EltTy->isDependentType() || EltTy->isConstantSizeType()) && 1338 "Constant array of VLAs is illegal!"); 1339 1340 // Convert the array size into a canonical width matching the pointer size for 1341 // the target. 1342 llvm::APInt ArySize(ArySizeIn); 1343 ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace())); 1344 1345 llvm::FoldingSetNodeID ID; 1346 ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals); 1347 1348 void *InsertPos = 0; 1349 if (ConstantArrayType *ATP = 1350 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1351 return QualType(ATP, 0); 1352 1353 // If the element type isn't canonical, this won't be a canonical type either, 1354 // so fill in the canonical type field. 1355 QualType Canonical; 1356 if (!EltTy.isCanonical()) { 1357 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 1358 ASM, EltTypeQuals); 1359 // Get the new insert position for the node we care about. 1360 ConstantArrayType *NewIP = 1361 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1362 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1363 } 1364 1365 ConstantArrayType *New = new(*this,TypeAlignment) 1366 ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 1367 ConstantArrayTypes.InsertNode(New, InsertPos); 1368 Types.push_back(New); 1369 return QualType(New, 0); 1370} 1371 1372/// getVariableArrayType - Returns a non-unique reference to the type for a 1373/// variable array of the specified element type. 1374QualType ASTContext::getVariableArrayType(QualType EltTy, 1375 Expr *NumElts, 1376 ArrayType::ArraySizeModifier ASM, 1377 unsigned EltTypeQuals, 1378 SourceRange Brackets) { 1379 // Since we don't unique expressions, it isn't possible to unique VLA's 1380 // that have an expression provided for their size. 1381 1382 VariableArrayType *New = new(*this, TypeAlignment) 1383 VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals, Brackets); 1384 1385 VariableArrayTypes.push_back(New); 1386 Types.push_back(New); 1387 return QualType(New, 0); 1388} 1389 1390/// getDependentSizedArrayType - Returns a non-unique reference to 1391/// the type for a dependently-sized array of the specified element 1392/// type. 1393QualType ASTContext::getDependentSizedArrayType(QualType EltTy, 1394 Expr *NumElts, 1395 ArrayType::ArraySizeModifier ASM, 1396 unsigned EltTypeQuals, 1397 SourceRange Brackets) { 1398 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 1399 "Size must be type- or value-dependent!"); 1400 1401 llvm::FoldingSetNodeID ID; 1402 DependentSizedArrayType::Profile(ID, *this, getCanonicalType(EltTy), ASM, 1403 EltTypeQuals, NumElts); 1404 1405 void *InsertPos = 0; 1406 DependentSizedArrayType *Canon 1407 = DependentSizedArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1408 DependentSizedArrayType *New; 1409 if (Canon) { 1410 // We already have a canonical version of this array type; use it as 1411 // the canonical type for a newly-built type. 1412 New = new (*this, TypeAlignment) 1413 DependentSizedArrayType(*this, EltTy, QualType(Canon, 0), 1414 NumElts, ASM, EltTypeQuals, Brackets); 1415 } else { 1416 QualType CanonEltTy = getCanonicalType(EltTy); 1417 if (CanonEltTy == EltTy) { 1418 New = new (*this, TypeAlignment) 1419 DependentSizedArrayType(*this, EltTy, QualType(), 1420 NumElts, ASM, EltTypeQuals, Brackets); 1421 DependentSizedArrayTypes.InsertNode(New, InsertPos); 1422 } else { 1423 QualType Canon = getDependentSizedArrayType(CanonEltTy, NumElts, 1424 ASM, EltTypeQuals, 1425 SourceRange()); 1426 New = new (*this, TypeAlignment) 1427 DependentSizedArrayType(*this, EltTy, Canon, 1428 NumElts, ASM, EltTypeQuals, Brackets); 1429 } 1430 } 1431 1432 Types.push_back(New); 1433 return QualType(New, 0); 1434} 1435 1436QualType ASTContext::getIncompleteArrayType(QualType EltTy, 1437 ArrayType::ArraySizeModifier ASM, 1438 unsigned EltTypeQuals) { 1439 llvm::FoldingSetNodeID ID; 1440 IncompleteArrayType::Profile(ID, EltTy, ASM, EltTypeQuals); 1441 1442 void *InsertPos = 0; 1443 if (IncompleteArrayType *ATP = 1444 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 1445 return QualType(ATP, 0); 1446 1447 // If the element type isn't canonical, this won't be a canonical type 1448 // either, so fill in the canonical type field. 1449 QualType Canonical; 1450 1451 if (!EltTy.isCanonical()) { 1452 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 1453 ASM, EltTypeQuals); 1454 1455 // Get the new insert position for the node we care about. 1456 IncompleteArrayType *NewIP = 1457 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 1458 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1459 } 1460 1461 IncompleteArrayType *New = new (*this, TypeAlignment) 1462 IncompleteArrayType(EltTy, Canonical, ASM, EltTypeQuals); 1463 1464 IncompleteArrayTypes.InsertNode(New, InsertPos); 1465 Types.push_back(New); 1466 return QualType(New, 0); 1467} 1468 1469/// getVectorType - Return the unique reference to a vector type of 1470/// the specified element type and size. VectorType must be a built-in type. 1471QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 1472 BuiltinType *baseType; 1473 1474 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1475 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 1476 1477 // Check if we've already instantiated a vector of this type. 1478 llvm::FoldingSetNodeID ID; 1479 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 1480 void *InsertPos = 0; 1481 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1482 return QualType(VTP, 0); 1483 1484 // If the element type isn't canonical, this won't be a canonical type either, 1485 // so fill in the canonical type field. 1486 QualType Canonical; 1487 if (!vecType.isCanonical()) { 1488 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 1489 1490 // Get the new insert position for the node we care about. 1491 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1492 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1493 } 1494 VectorType *New = new (*this, TypeAlignment) 1495 VectorType(vecType, NumElts, Canonical); 1496 VectorTypes.InsertNode(New, InsertPos); 1497 Types.push_back(New); 1498 return QualType(New, 0); 1499} 1500 1501/// getExtVectorType - Return the unique reference to an extended vector type of 1502/// the specified element type and size. VectorType must be a built-in type. 1503QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 1504 BuiltinType *baseType; 1505 1506 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 1507 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 1508 1509 // Check if we've already instantiated a vector of this type. 1510 llvm::FoldingSetNodeID ID; 1511 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 1512 void *InsertPos = 0; 1513 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 1514 return QualType(VTP, 0); 1515 1516 // If the element type isn't canonical, this won't be a canonical type either, 1517 // so fill in the canonical type field. 1518 QualType Canonical; 1519 if (!vecType.isCanonical()) { 1520 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 1521 1522 // Get the new insert position for the node we care about. 1523 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1524 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1525 } 1526 ExtVectorType *New = new (*this, TypeAlignment) 1527 ExtVectorType(vecType, NumElts, Canonical); 1528 VectorTypes.InsertNode(New, InsertPos); 1529 Types.push_back(New); 1530 return QualType(New, 0); 1531} 1532 1533QualType ASTContext::getDependentSizedExtVectorType(QualType vecType, 1534 Expr *SizeExpr, 1535 SourceLocation AttrLoc) { 1536 llvm::FoldingSetNodeID ID; 1537 DependentSizedExtVectorType::Profile(ID, *this, getCanonicalType(vecType), 1538 SizeExpr); 1539 1540 void *InsertPos = 0; 1541 DependentSizedExtVectorType *Canon 1542 = DependentSizedExtVectorTypes.FindNodeOrInsertPos(ID, InsertPos); 1543 DependentSizedExtVectorType *New; 1544 if (Canon) { 1545 // We already have a canonical version of this array type; use it as 1546 // the canonical type for a newly-built type. 1547 New = new (*this, TypeAlignment) 1548 DependentSizedExtVectorType(*this, vecType, QualType(Canon, 0), 1549 SizeExpr, AttrLoc); 1550 } else { 1551 QualType CanonVecTy = getCanonicalType(vecType); 1552 if (CanonVecTy == vecType) { 1553 New = new (*this, TypeAlignment) 1554 DependentSizedExtVectorType(*this, vecType, QualType(), SizeExpr, 1555 AttrLoc); 1556 DependentSizedExtVectorTypes.InsertNode(New, InsertPos); 1557 } else { 1558 QualType Canon = getDependentSizedExtVectorType(CanonVecTy, SizeExpr, 1559 SourceLocation()); 1560 New = new (*this, TypeAlignment) 1561 DependentSizedExtVectorType(*this, vecType, Canon, SizeExpr, AttrLoc); 1562 } 1563 } 1564 1565 Types.push_back(New); 1566 return QualType(New, 0); 1567} 1568 1569/// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 1570/// 1571QualType ASTContext::getFunctionNoProtoType(QualType ResultTy, bool NoReturn) { 1572 // Unique functions, to guarantee there is only one function of a particular 1573 // structure. 1574 llvm::FoldingSetNodeID ID; 1575 FunctionNoProtoType::Profile(ID, ResultTy, NoReturn); 1576 1577 void *InsertPos = 0; 1578 if (FunctionNoProtoType *FT = 1579 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1580 return QualType(FT, 0); 1581 1582 QualType Canonical; 1583 if (!ResultTy.isCanonical()) { 1584 Canonical = getFunctionNoProtoType(getCanonicalType(ResultTy), NoReturn); 1585 1586 // Get the new insert position for the node we care about. 1587 FunctionNoProtoType *NewIP = 1588 FunctionNoProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1589 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1590 } 1591 1592 FunctionNoProtoType *New = new (*this, TypeAlignment) 1593 FunctionNoProtoType(ResultTy, Canonical, NoReturn); 1594 Types.push_back(New); 1595 FunctionNoProtoTypes.InsertNode(New, InsertPos); 1596 return QualType(New, 0); 1597} 1598 1599/// getFunctionType - Return a normal function type with a typed argument 1600/// list. isVariadic indicates whether the argument list includes '...'. 1601QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1602 unsigned NumArgs, bool isVariadic, 1603 unsigned TypeQuals, bool hasExceptionSpec, 1604 bool hasAnyExceptionSpec, unsigned NumExs, 1605 const QualType *ExArray, bool NoReturn) { 1606 if (LangOpts.CPlusPlus) { 1607 for (unsigned i = 0; i != NumArgs; ++i) 1608 assert(!ArgArray[i].hasQualifiers() && 1609 "C++ arguments can't have toplevel qualifiers!"); 1610 } 1611 1612 // Unique functions, to guarantee there is only one function of a particular 1613 // structure. 1614 llvm::FoldingSetNodeID ID; 1615 FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1616 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1617 NumExs, ExArray, NoReturn); 1618 1619 void *InsertPos = 0; 1620 if (FunctionProtoType *FTP = 1621 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos)) 1622 return QualType(FTP, 0); 1623 1624 // Determine whether the type being created is already canonical or not. 1625 bool isCanonical = ResultTy.isCanonical(); 1626 if (hasExceptionSpec) 1627 isCanonical = false; 1628 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1629 if (!ArgArray[i].isCanonical()) 1630 isCanonical = false; 1631 1632 // If this type isn't canonical, get the canonical version of it. 1633 // The exception spec is not part of the canonical type. 1634 QualType Canonical; 1635 if (!isCanonical) { 1636 llvm::SmallVector<QualType, 16> CanonicalArgs; 1637 CanonicalArgs.reserve(NumArgs); 1638 for (unsigned i = 0; i != NumArgs; ++i) 1639 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1640 1641 Canonical = getFunctionType(getCanonicalType(ResultTy), 1642 CanonicalArgs.data(), NumArgs, 1643 isVariadic, TypeQuals, false, 1644 false, 0, 0, NoReturn); 1645 1646 // Get the new insert position for the node we care about. 1647 FunctionProtoType *NewIP = 1648 FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos); 1649 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1650 } 1651 1652 // FunctionProtoType objects are allocated with extra bytes after them 1653 // for two variable size arrays (for parameter and exception types) at the 1654 // end of them. 1655 FunctionProtoType *FTP = 1656 (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 1657 NumArgs*sizeof(QualType) + 1658 NumExs*sizeof(QualType), TypeAlignment); 1659 new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic, 1660 TypeQuals, hasExceptionSpec, hasAnyExceptionSpec, 1661 ExArray, NumExs, Canonical, NoReturn); 1662 Types.push_back(FTP); 1663 FunctionProtoTypes.InsertNode(FTP, InsertPos); 1664 return QualType(FTP, 0); 1665} 1666 1667/// getTypeDeclType - Return the unique reference to the type for the 1668/// specified type declaration. 1669QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1670 assert(Decl && "Passed null for Decl param"); 1671 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1672 1673 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1674 return getTypedefType(Typedef); 1675 else if (isa<TemplateTypeParmDecl>(Decl)) { 1676 assert(false && "Template type parameter types are always available."); 1677 } else if (ObjCInterfaceDecl *ObjCInterface 1678 = dyn_cast<ObjCInterfaceDecl>(Decl)) 1679 return getObjCInterfaceType(ObjCInterface); 1680 1681 if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1682 if (PrevDecl) 1683 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1684 else 1685 Decl->TypeForDecl = new (*this, TypeAlignment) RecordType(Record); 1686 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1687 if (PrevDecl) 1688 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1689 else 1690 Decl->TypeForDecl = new (*this, TypeAlignment) EnumType(Enum); 1691 } else 1692 assert(false && "TypeDecl without a type?"); 1693 1694 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1695 return QualType(Decl->TypeForDecl, 0); 1696} 1697 1698/// getTypedefType - Return the unique reference to the type for the 1699/// specified typename decl. 1700QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1701 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1702 1703 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1704 Decl->TypeForDecl = new(*this, TypeAlignment) 1705 TypedefType(Type::Typedef, Decl, Canonical); 1706 Types.push_back(Decl->TypeForDecl); 1707 return QualType(Decl->TypeForDecl, 0); 1708} 1709 1710/// \brief Retrieve a substitution-result type. 1711QualType 1712ASTContext::getSubstTemplateTypeParmType(const TemplateTypeParmType *Parm, 1713 QualType Replacement) { 1714 assert(Replacement.isCanonical() 1715 && "replacement types must always be canonical"); 1716 1717 llvm::FoldingSetNodeID ID; 1718 SubstTemplateTypeParmType::Profile(ID, Parm, Replacement); 1719 void *InsertPos = 0; 1720 SubstTemplateTypeParmType *SubstParm 1721 = SubstTemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1722 1723 if (!SubstParm) { 1724 SubstParm = new (*this, TypeAlignment) 1725 SubstTemplateTypeParmType(Parm, Replacement); 1726 Types.push_back(SubstParm); 1727 SubstTemplateTypeParmTypes.InsertNode(SubstParm, InsertPos); 1728 } 1729 1730 return QualType(SubstParm, 0); 1731} 1732 1733/// \brief Retrieve the template type parameter type for a template 1734/// parameter or parameter pack with the given depth, index, and (optionally) 1735/// name. 1736QualType ASTContext::getTemplateTypeParmType(unsigned Depth, unsigned Index, 1737 bool ParameterPack, 1738 IdentifierInfo *Name) { 1739 llvm::FoldingSetNodeID ID; 1740 TemplateTypeParmType::Profile(ID, Depth, Index, ParameterPack, Name); 1741 void *InsertPos = 0; 1742 TemplateTypeParmType *TypeParm 1743 = TemplateTypeParmTypes.FindNodeOrInsertPos(ID, InsertPos); 1744 1745 if (TypeParm) 1746 return QualType(TypeParm, 0); 1747 1748 if (Name) { 1749 QualType Canon = getTemplateTypeParmType(Depth, Index, ParameterPack); 1750 TypeParm = new (*this, TypeAlignment) 1751 TemplateTypeParmType(Depth, Index, ParameterPack, Name, Canon); 1752 } else 1753 TypeParm = new (*this, TypeAlignment) 1754 TemplateTypeParmType(Depth, Index, ParameterPack); 1755 1756 Types.push_back(TypeParm); 1757 TemplateTypeParmTypes.InsertNode(TypeParm, InsertPos); 1758 1759 return QualType(TypeParm, 0); 1760} 1761 1762QualType 1763ASTContext::getTemplateSpecializationType(TemplateName Template, 1764 const TemplateArgument *Args, 1765 unsigned NumArgs, 1766 QualType Canon) { 1767 if (!Canon.isNull()) 1768 Canon = getCanonicalType(Canon); 1769 else { 1770 // Build the canonical template specialization type. 1771 TemplateName CanonTemplate = getCanonicalTemplateName(Template); 1772 llvm::SmallVector<TemplateArgument, 4> CanonArgs; 1773 CanonArgs.reserve(NumArgs); 1774 for (unsigned I = 0; I != NumArgs; ++I) 1775 CanonArgs.push_back(getCanonicalTemplateArgument(Args[I])); 1776 1777 // Determine whether this canonical template specialization type already 1778 // exists. 1779 llvm::FoldingSetNodeID ID; 1780 TemplateSpecializationType::Profile(ID, CanonTemplate, 1781 CanonArgs.data(), NumArgs, *this); 1782 1783 void *InsertPos = 0; 1784 TemplateSpecializationType *Spec 1785 = TemplateSpecializationTypes.FindNodeOrInsertPos(ID, InsertPos); 1786 1787 if (!Spec) { 1788 // Allocate a new canonical template specialization type. 1789 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1790 sizeof(TemplateArgument) * NumArgs), 1791 TypeAlignment); 1792 Spec = new (Mem) TemplateSpecializationType(*this, CanonTemplate, 1793 CanonArgs.data(), NumArgs, 1794 Canon); 1795 Types.push_back(Spec); 1796 TemplateSpecializationTypes.InsertNode(Spec, InsertPos); 1797 } 1798 1799 if (Canon.isNull()) 1800 Canon = QualType(Spec, 0); 1801 assert(Canon->isDependentType() && 1802 "Non-dependent template-id type must have a canonical type"); 1803 } 1804 1805 // Allocate the (non-canonical) template specialization type, but don't 1806 // try to unique it: these types typically have location information that 1807 // we don't unique and don't want to lose. 1808 void *Mem = Allocate((sizeof(TemplateSpecializationType) + 1809 sizeof(TemplateArgument) * NumArgs), 1810 TypeAlignment); 1811 TemplateSpecializationType *Spec 1812 = new (Mem) TemplateSpecializationType(*this, Template, Args, NumArgs, 1813 Canon); 1814 1815 Types.push_back(Spec); 1816 return QualType(Spec, 0); 1817} 1818 1819QualType 1820ASTContext::getQualifiedNameType(NestedNameSpecifier *NNS, 1821 QualType NamedType) { 1822 llvm::FoldingSetNodeID ID; 1823 QualifiedNameType::Profile(ID, NNS, NamedType); 1824 1825 void *InsertPos = 0; 1826 QualifiedNameType *T 1827 = QualifiedNameTypes.FindNodeOrInsertPos(ID, InsertPos); 1828 if (T) 1829 return QualType(T, 0); 1830 1831 T = new (*this) QualifiedNameType(NNS, NamedType, 1832 getCanonicalType(NamedType)); 1833 Types.push_back(T); 1834 QualifiedNameTypes.InsertNode(T, InsertPos); 1835 return QualType(T, 0); 1836} 1837 1838QualType ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1839 const IdentifierInfo *Name, 1840 QualType Canon) { 1841 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1842 1843 if (Canon.isNull()) { 1844 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1845 if (CanonNNS != NNS) 1846 Canon = getTypenameType(CanonNNS, Name); 1847 } 1848 1849 llvm::FoldingSetNodeID ID; 1850 TypenameType::Profile(ID, NNS, Name); 1851 1852 void *InsertPos = 0; 1853 TypenameType *T 1854 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1855 if (T) 1856 return QualType(T, 0); 1857 1858 T = new (*this) TypenameType(NNS, Name, Canon); 1859 Types.push_back(T); 1860 TypenameTypes.InsertNode(T, InsertPos); 1861 return QualType(T, 0); 1862} 1863 1864QualType 1865ASTContext::getTypenameType(NestedNameSpecifier *NNS, 1866 const TemplateSpecializationType *TemplateId, 1867 QualType Canon) { 1868 assert(NNS->isDependent() && "nested-name-specifier must be dependent"); 1869 1870 if (Canon.isNull()) { 1871 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 1872 QualType CanonType = getCanonicalType(QualType(TemplateId, 0)); 1873 if (CanonNNS != NNS || CanonType != QualType(TemplateId, 0)) { 1874 const TemplateSpecializationType *CanonTemplateId 1875 = CanonType->getAs<TemplateSpecializationType>(); 1876 assert(CanonTemplateId && 1877 "Canonical type must also be a template specialization type"); 1878 Canon = getTypenameType(CanonNNS, CanonTemplateId); 1879 } 1880 } 1881 1882 llvm::FoldingSetNodeID ID; 1883 TypenameType::Profile(ID, NNS, TemplateId); 1884 1885 void *InsertPos = 0; 1886 TypenameType *T 1887 = TypenameTypes.FindNodeOrInsertPos(ID, InsertPos); 1888 if (T) 1889 return QualType(T, 0); 1890 1891 T = new (*this) TypenameType(NNS, TemplateId, Canon); 1892 Types.push_back(T); 1893 TypenameTypes.InsertNode(T, InsertPos); 1894 return QualType(T, 0); 1895} 1896 1897QualType 1898ASTContext::getElaboratedType(QualType UnderlyingType, 1899 ElaboratedType::TagKind Tag) { 1900 llvm::FoldingSetNodeID ID; 1901 ElaboratedType::Profile(ID, UnderlyingType, Tag); 1902 1903 void *InsertPos = 0; 1904 ElaboratedType *T = ElaboratedTypes.FindNodeOrInsertPos(ID, InsertPos); 1905 if (T) 1906 return QualType(T, 0); 1907 1908 QualType Canon = getCanonicalType(UnderlyingType); 1909 1910 T = new (*this) ElaboratedType(UnderlyingType, Tag, Canon); 1911 Types.push_back(T); 1912 ElaboratedTypes.InsertNode(T, InsertPos); 1913 return QualType(T, 0); 1914} 1915 1916/// CmpProtocolNames - Comparison predicate for sorting protocols 1917/// alphabetically. 1918static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1919 const ObjCProtocolDecl *RHS) { 1920 return LHS->getDeclName() < RHS->getDeclName(); 1921} 1922 1923static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1924 unsigned &NumProtocols) { 1925 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1926 1927 // Sort protocols, keyed by name. 1928 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1929 1930 // Remove duplicates. 1931 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1932 NumProtocols = ProtocolsEnd-Protocols; 1933} 1934 1935/// getObjCObjectPointerType - Return a ObjCObjectPointerType type for 1936/// the given interface decl and the conforming protocol list. 1937QualType ASTContext::getObjCObjectPointerType(QualType InterfaceT, 1938 ObjCProtocolDecl **Protocols, 1939 unsigned NumProtocols) { 1940 // Sort the protocol list alphabetically to canonicalize it. 1941 if (NumProtocols) 1942 SortAndUniqueProtocols(Protocols, NumProtocols); 1943 1944 llvm::FoldingSetNodeID ID; 1945 ObjCObjectPointerType::Profile(ID, InterfaceT, Protocols, NumProtocols); 1946 1947 void *InsertPos = 0; 1948 if (ObjCObjectPointerType *QT = 1949 ObjCObjectPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 1950 return QualType(QT, 0); 1951 1952 // No Match; 1953 ObjCObjectPointerType *QType = new (*this, TypeAlignment) 1954 ObjCObjectPointerType(InterfaceT, Protocols, NumProtocols); 1955 1956 Types.push_back(QType); 1957 ObjCObjectPointerTypes.InsertNode(QType, InsertPos); 1958 return QualType(QType, 0); 1959} 1960 1961/// getObjCInterfaceType - Return the unique reference to the type for the 1962/// specified ObjC interface decl. The list of protocols is optional. 1963QualType ASTContext::getObjCInterfaceType(const ObjCInterfaceDecl *Decl, 1964 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1965 if (NumProtocols) 1966 // Sort the protocol list alphabetically to canonicalize it. 1967 SortAndUniqueProtocols(Protocols, NumProtocols); 1968 1969 llvm::FoldingSetNodeID ID; 1970 ObjCInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1971 1972 void *InsertPos = 0; 1973 if (ObjCInterfaceType *QT = 1974 ObjCInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1975 return QualType(QT, 0); 1976 1977 // No Match; 1978 ObjCInterfaceType *QType = new (*this, TypeAlignment) 1979 ObjCInterfaceType(const_cast<ObjCInterfaceDecl*>(Decl), 1980 Protocols, NumProtocols); 1981 Types.push_back(QType); 1982 ObjCInterfaceTypes.InsertNode(QType, InsertPos); 1983 return QualType(QType, 0); 1984} 1985 1986QualType ASTContext::getObjCProtocolListType(QualType T, 1987 ObjCProtocolDecl **Protocols, 1988 unsigned NumProtocols) { 1989 llvm::FoldingSetNodeID ID; 1990 ObjCProtocolListType::Profile(ID, T, Protocols, NumProtocols); 1991 1992 void *InsertPos = 0; 1993 if (ObjCProtocolListType *QT = 1994 ObjCProtocolListTypes.FindNodeOrInsertPos(ID, InsertPos)) 1995 return QualType(QT, 0); 1996 1997 // No Match; 1998 ObjCProtocolListType *QType = new (*this, TypeAlignment) 1999 ObjCProtocolListType(T, Protocols, NumProtocols); 2000 Types.push_back(QType); 2001 ObjCProtocolListTypes.InsertNode(QType, InsertPos); 2002 return QualType(QType, 0); 2003} 2004 2005/// getTypeOfExprType - Unlike many "get<Type>" functions, we can't unique 2006/// TypeOfExprType AST's (since expression's are never shared). For example, 2007/// multiple declarations that refer to "typeof(x)" all contain different 2008/// DeclRefExpr's. This doesn't effect the type checker, since it operates 2009/// on canonical type's (which are always unique). 2010QualType ASTContext::getTypeOfExprType(Expr *tofExpr) { 2011 TypeOfExprType *toe; 2012 if (tofExpr->isTypeDependent()) { 2013 llvm::FoldingSetNodeID ID; 2014 DependentTypeOfExprType::Profile(ID, *this, tofExpr); 2015 2016 void *InsertPos = 0; 2017 DependentTypeOfExprType *Canon 2018 = DependentTypeOfExprTypes.FindNodeOrInsertPos(ID, InsertPos); 2019 if (Canon) { 2020 // We already have a "canonical" version of an identical, dependent 2021 // typeof(expr) type. Use that as our canonical type. 2022 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, 2023 QualType((TypeOfExprType*)Canon, 0)); 2024 } 2025 else { 2026 // Build a new, canonical typeof(expr) type. 2027 Canon 2028 = new (*this, TypeAlignment) DependentTypeOfExprType(*this, tofExpr); 2029 DependentTypeOfExprTypes.InsertNode(Canon, InsertPos); 2030 toe = Canon; 2031 } 2032 } else { 2033 QualType Canonical = getCanonicalType(tofExpr->getType()); 2034 toe = new (*this, TypeAlignment) TypeOfExprType(tofExpr, Canonical); 2035 } 2036 Types.push_back(toe); 2037 return QualType(toe, 0); 2038} 2039 2040/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 2041/// TypeOfType AST's. The only motivation to unique these nodes would be 2042/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 2043/// an issue. This doesn't effect the type checker, since it operates 2044/// on canonical type's (which are always unique). 2045QualType ASTContext::getTypeOfType(QualType tofType) { 2046 QualType Canonical = getCanonicalType(tofType); 2047 TypeOfType *tot = new (*this, TypeAlignment) TypeOfType(tofType, Canonical); 2048 Types.push_back(tot); 2049 return QualType(tot, 0); 2050} 2051 2052/// getDecltypeForExpr - Given an expr, will return the decltype for that 2053/// expression, according to the rules in C++0x [dcl.type.simple]p4 2054static QualType getDecltypeForExpr(const Expr *e, ASTContext &Context) { 2055 if (e->isTypeDependent()) 2056 return Context.DependentTy; 2057 2058 // If e is an id expression or a class member access, decltype(e) is defined 2059 // as the type of the entity named by e. 2060 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(e)) { 2061 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 2062 return VD->getType(); 2063 } 2064 if (const MemberExpr *ME = dyn_cast<MemberExpr>(e)) { 2065 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2066 return FD->getType(); 2067 } 2068 // If e is a function call or an invocation of an overloaded operator, 2069 // (parentheses around e are ignored), decltype(e) is defined as the 2070 // return type of that function. 2071 if (const CallExpr *CE = dyn_cast<CallExpr>(e->IgnoreParens())) 2072 return CE->getCallReturnType(); 2073 2074 QualType T = e->getType(); 2075 2076 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 2077 // defined as T&, otherwise decltype(e) is defined as T. 2078 if (e->isLvalue(Context) == Expr::LV_Valid) 2079 T = Context.getLValueReferenceType(T); 2080 2081 return T; 2082} 2083 2084/// getDecltypeType - Unlike many "get<Type>" functions, we don't unique 2085/// DecltypeType AST's. The only motivation to unique these nodes would be 2086/// memory savings. Since decltype(t) is fairly uncommon, space shouldn't be 2087/// an issue. This doesn't effect the type checker, since it operates 2088/// on canonical type's (which are always unique). 2089QualType ASTContext::getDecltypeType(Expr *e) { 2090 DecltypeType *dt; 2091 if (e->isTypeDependent()) { 2092 llvm::FoldingSetNodeID ID; 2093 DependentDecltypeType::Profile(ID, *this, e); 2094 2095 void *InsertPos = 0; 2096 DependentDecltypeType *Canon 2097 = DependentDecltypeTypes.FindNodeOrInsertPos(ID, InsertPos); 2098 if (Canon) { 2099 // We already have a "canonical" version of an equivalent, dependent 2100 // decltype type. Use that as our canonical type. 2101 dt = new (*this, TypeAlignment) DecltypeType(e, DependentTy, 2102 QualType((DecltypeType*)Canon, 0)); 2103 } 2104 else { 2105 // Build a new, canonical typeof(expr) type. 2106 Canon = new (*this, TypeAlignment) DependentDecltypeType(*this, e); 2107 DependentDecltypeTypes.InsertNode(Canon, InsertPos); 2108 dt = Canon; 2109 } 2110 } else { 2111 QualType T = getDecltypeForExpr(e, *this); 2112 dt = new (*this, TypeAlignment) DecltypeType(e, T, getCanonicalType(T)); 2113 } 2114 Types.push_back(dt); 2115 return QualType(dt, 0); 2116} 2117 2118/// getTagDeclType - Return the unique reference to the type for the 2119/// specified TagDecl (struct/union/class/enum) decl. 2120QualType ASTContext::getTagDeclType(const TagDecl *Decl) { 2121 assert (Decl); 2122 // FIXME: What is the design on getTagDeclType when it requires casting 2123 // away const? mutable? 2124 return getTypeDeclType(const_cast<TagDecl*>(Decl)); 2125} 2126 2127/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 2128/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 2129/// needs to agree with the definition in <stddef.h>. 2130QualType ASTContext::getSizeType() const { 2131 return getFromTargetType(Target.getSizeType()); 2132} 2133 2134/// getSignedWCharType - Return the type of "signed wchar_t". 2135/// Used when in C++, as a GCC extension. 2136QualType ASTContext::getSignedWCharType() const { 2137 // FIXME: derive from "Target" ? 2138 return WCharTy; 2139} 2140 2141/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 2142/// Used when in C++, as a GCC extension. 2143QualType ASTContext::getUnsignedWCharType() const { 2144 // FIXME: derive from "Target" ? 2145 return UnsignedIntTy; 2146} 2147 2148/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 2149/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 2150QualType ASTContext::getPointerDiffType() const { 2151 return getFromTargetType(Target.getPtrDiffType(0)); 2152} 2153 2154//===----------------------------------------------------------------------===// 2155// Type Operators 2156//===----------------------------------------------------------------------===// 2157 2158/// getCanonicalType - Return the canonical (structural) type corresponding to 2159/// the specified potentially non-canonical type. The non-canonical version 2160/// of a type may have many "decorated" versions of types. Decorators can 2161/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 2162/// to be free of any of these, allowing two canonical types to be compared 2163/// for exact equality with a simple pointer comparison. 2164CanQualType ASTContext::getCanonicalType(QualType T) { 2165 QualifierCollector Quals; 2166 const Type *Ptr = Quals.strip(T); 2167 QualType CanType = Ptr->getCanonicalTypeInternal(); 2168 2169 // The canonical internal type will be the canonical type *except* 2170 // that we push type qualifiers down through array types. 2171 2172 // If there are no new qualifiers to push down, stop here. 2173 if (!Quals.hasQualifiers()) 2174 return CanQualType::CreateUnsafe(CanType); 2175 2176 // If the type qualifiers are on an array type, get the canonical 2177 // type of the array with the qualifiers applied to the element 2178 // type. 2179 ArrayType *AT = dyn_cast<ArrayType>(CanType); 2180 if (!AT) 2181 return CanQualType::CreateUnsafe(getQualifiedType(CanType, Quals)); 2182 2183 // Get the canonical version of the element with the extra qualifiers on it. 2184 // This can recursively sink qualifiers through multiple levels of arrays. 2185 QualType NewEltTy = getQualifiedType(AT->getElementType(), Quals); 2186 NewEltTy = getCanonicalType(NewEltTy); 2187 2188 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 2189 return CanQualType::CreateUnsafe( 2190 getConstantArrayType(NewEltTy, CAT->getSize(), 2191 CAT->getSizeModifier(), 2192 CAT->getIndexTypeCVRQualifiers())); 2193 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 2194 return CanQualType::CreateUnsafe( 2195 getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 2196 IAT->getIndexTypeCVRQualifiers())); 2197 2198 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 2199 return CanQualType::CreateUnsafe( 2200 getDependentSizedArrayType(NewEltTy, 2201 DSAT->getSizeExpr() ? 2202 DSAT->getSizeExpr()->Retain() : 0, 2203 DSAT->getSizeModifier(), 2204 DSAT->getIndexTypeCVRQualifiers(), 2205 DSAT->getBracketsRange())); 2206 2207 VariableArrayType *VAT = cast<VariableArrayType>(AT); 2208 return CanQualType::CreateUnsafe(getVariableArrayType(NewEltTy, 2209 VAT->getSizeExpr() ? 2210 VAT->getSizeExpr()->Retain() : 0, 2211 VAT->getSizeModifier(), 2212 VAT->getIndexTypeCVRQualifiers(), 2213 VAT->getBracketsRange())); 2214} 2215 2216TemplateName ASTContext::getCanonicalTemplateName(TemplateName Name) { 2217 // If this template name refers to a template, the canonical 2218 // template name merely stores the template itself. 2219 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 2220 return TemplateName(cast<TemplateDecl>(Template->getCanonicalDecl())); 2221 2222 // If this template name refers to a set of overloaded function templates, 2223 /// the canonical template name merely stores the set of function templates. 2224 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) { 2225 OverloadedFunctionDecl *CanonOvl = 0; 2226 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 2227 FEnd = Ovl->function_end(); 2228 F != FEnd; ++F) { 2229 Decl *Canon = F->get()->getCanonicalDecl(); 2230 if (CanonOvl || Canon != F->get()) { 2231 if (!CanonOvl) 2232 CanonOvl = OverloadedFunctionDecl::Create(*this, 2233 Ovl->getDeclContext(), 2234 Ovl->getDeclName()); 2235 2236 CanonOvl->addOverload( 2237 AnyFunctionDecl::getFromNamedDecl(cast<NamedDecl>(Canon))); 2238 } 2239 } 2240 2241 return TemplateName(CanonOvl? CanonOvl : Ovl); 2242 } 2243 2244 DependentTemplateName *DTN = Name.getAsDependentTemplateName(); 2245 assert(DTN && "Non-dependent template names must refer to template decls."); 2246 return DTN->CanonicalTemplateName; 2247} 2248 2249TemplateArgument 2250ASTContext::getCanonicalTemplateArgument(const TemplateArgument &Arg) { 2251 switch (Arg.getKind()) { 2252 case TemplateArgument::Null: 2253 return Arg; 2254 2255 case TemplateArgument::Expression: 2256 // FIXME: Build canonical expression? 2257 return Arg; 2258 2259 case TemplateArgument::Declaration: 2260 return TemplateArgument(SourceLocation(), 2261 Arg.getAsDecl()->getCanonicalDecl()); 2262 2263 case TemplateArgument::Integral: 2264 return TemplateArgument(SourceLocation(), 2265 *Arg.getAsIntegral(), 2266 getCanonicalType(Arg.getIntegralType())); 2267 2268 case TemplateArgument::Type: 2269 return TemplateArgument(SourceLocation(), 2270 getCanonicalType(Arg.getAsType())); 2271 2272 case TemplateArgument::Pack: { 2273 // FIXME: Allocate in ASTContext 2274 TemplateArgument *CanonArgs = new TemplateArgument[Arg.pack_size()]; 2275 unsigned Idx = 0; 2276 for (TemplateArgument::pack_iterator A = Arg.pack_begin(), 2277 AEnd = Arg.pack_end(); 2278 A != AEnd; (void)++A, ++Idx) 2279 CanonArgs[Idx] = getCanonicalTemplateArgument(*A); 2280 2281 TemplateArgument Result; 2282 Result.setArgumentPack(CanonArgs, Arg.pack_size(), false); 2283 return Result; 2284 } 2285 } 2286 2287 // Silence GCC warning 2288 assert(false && "Unhandled template argument kind"); 2289 return TemplateArgument(); 2290} 2291 2292NestedNameSpecifier * 2293ASTContext::getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) { 2294 if (!NNS) 2295 return 0; 2296 2297 switch (NNS->getKind()) { 2298 case NestedNameSpecifier::Identifier: 2299 // Canonicalize the prefix but keep the identifier the same. 2300 return NestedNameSpecifier::Create(*this, 2301 getCanonicalNestedNameSpecifier(NNS->getPrefix()), 2302 NNS->getAsIdentifier()); 2303 2304 case NestedNameSpecifier::Namespace: 2305 // A namespace is canonical; build a nested-name-specifier with 2306 // this namespace and no prefix. 2307 return NestedNameSpecifier::Create(*this, 0, NNS->getAsNamespace()); 2308 2309 case NestedNameSpecifier::TypeSpec: 2310 case NestedNameSpecifier::TypeSpecWithTemplate: { 2311 QualType T = getCanonicalType(QualType(NNS->getAsType(), 0)); 2312 return NestedNameSpecifier::Create(*this, 0, 2313 NNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate, 2314 T.getTypePtr()); 2315 } 2316 2317 case NestedNameSpecifier::Global: 2318 // The global specifier is canonical and unique. 2319 return NNS; 2320 } 2321 2322 // Required to silence a GCC warning 2323 return 0; 2324} 2325 2326 2327const ArrayType *ASTContext::getAsArrayType(QualType T) { 2328 // Handle the non-qualified case efficiently. 2329 if (!T.hasQualifiers()) { 2330 // Handle the common positive case fast. 2331 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 2332 return AT; 2333 } 2334 2335 // Handle the common negative case fast. 2336 QualType CType = T->getCanonicalTypeInternal(); 2337 if (!isa<ArrayType>(CType)) 2338 return 0; 2339 2340 // Apply any qualifiers from the array type to the element type. This 2341 // implements C99 6.7.3p8: "If the specification of an array type includes 2342 // any type qualifiers, the element type is so qualified, not the array type." 2343 2344 // If we get here, we either have type qualifiers on the type, or we have 2345 // sugar such as a typedef in the way. If we have type qualifiers on the type 2346 // we must propagate them down into the element type. 2347 2348 QualifierCollector Qs; 2349 const Type *Ty = Qs.strip(T.getDesugaredType()); 2350 2351 // If we have a simple case, just return now. 2352 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 2353 if (ATy == 0 || Qs.empty()) 2354 return ATy; 2355 2356 // Otherwise, we have an array and we have qualifiers on it. Push the 2357 // qualifiers into the array element type and return a new array type. 2358 // Get the canonical version of the element with the extra qualifiers on it. 2359 // This can recursively sink qualifiers through multiple levels of arrays. 2360 QualType NewEltTy = getQualifiedType(ATy->getElementType(), Qs); 2361 2362 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 2363 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 2364 CAT->getSizeModifier(), 2365 CAT->getIndexTypeCVRQualifiers())); 2366 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 2367 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 2368 IAT->getSizeModifier(), 2369 IAT->getIndexTypeCVRQualifiers())); 2370 2371 if (const DependentSizedArrayType *DSAT 2372 = dyn_cast<DependentSizedArrayType>(ATy)) 2373 return cast<ArrayType>( 2374 getDependentSizedArrayType(NewEltTy, 2375 DSAT->getSizeExpr() ? 2376 DSAT->getSizeExpr()->Retain() : 0, 2377 DSAT->getSizeModifier(), 2378 DSAT->getIndexTypeCVRQualifiers(), 2379 DSAT->getBracketsRange())); 2380 2381 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 2382 return cast<ArrayType>(getVariableArrayType(NewEltTy, 2383 VAT->getSizeExpr() ? 2384 VAT->getSizeExpr()->Retain() : 0, 2385 VAT->getSizeModifier(), 2386 VAT->getIndexTypeCVRQualifiers(), 2387 VAT->getBracketsRange())); 2388} 2389 2390 2391/// getArrayDecayedType - Return the properly qualified result of decaying the 2392/// specified array type to a pointer. This operation is non-trivial when 2393/// handling typedefs etc. The canonical type of "T" must be an array type, 2394/// this returns a pointer to a properly qualified element of the array. 2395/// 2396/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 2397QualType ASTContext::getArrayDecayedType(QualType Ty) { 2398 // Get the element type with 'getAsArrayType' so that we don't lose any 2399 // typedefs in the element type of the array. This also handles propagation 2400 // of type qualifiers from the array type into the element type if present 2401 // (C99 6.7.3p8). 2402 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 2403 assert(PrettyArrayType && "Not an array type!"); 2404 2405 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 2406 2407 // int x[restrict 4] -> int *restrict 2408 return getQualifiedType(PtrTy, PrettyArrayType->getIndexTypeQualifiers()); 2409} 2410 2411QualType ASTContext::getBaseElementType(QualType QT) { 2412 QualifierCollector Qs; 2413 while (true) { 2414 const Type *UT = Qs.strip(QT); 2415 if (const ArrayType *AT = getAsArrayType(QualType(UT,0))) { 2416 QT = AT->getElementType(); 2417 } else { 2418 return Qs.apply(QT); 2419 } 2420 } 2421} 2422 2423QualType ASTContext::getBaseElementType(const ArrayType *AT) { 2424 QualType ElemTy = AT->getElementType(); 2425 2426 if (const ArrayType *AT = getAsArrayType(ElemTy)) 2427 return getBaseElementType(AT); 2428 2429 return ElemTy; 2430} 2431 2432/// getConstantArrayElementCount - Returns number of constant array elements. 2433uint64_t 2434ASTContext::getConstantArrayElementCount(const ConstantArrayType *CA) const { 2435 uint64_t ElementCount = 1; 2436 do { 2437 ElementCount *= CA->getSize().getZExtValue(); 2438 CA = dyn_cast<ConstantArrayType>(CA->getElementType()); 2439 } while (CA); 2440 return ElementCount; 2441} 2442 2443/// getFloatingRank - Return a relative rank for floating point types. 2444/// This routine will assert if passed a built-in type that isn't a float. 2445static FloatingRank getFloatingRank(QualType T) { 2446 if (const ComplexType *CT = T->getAs<ComplexType>()) 2447 return getFloatingRank(CT->getElementType()); 2448 2449 assert(T->getAs<BuiltinType>() && "getFloatingRank(): not a floating type"); 2450 switch (T->getAs<BuiltinType>()->getKind()) { 2451 default: assert(0 && "getFloatingRank(): not a floating type"); 2452 case BuiltinType::Float: return FloatRank; 2453 case BuiltinType::Double: return DoubleRank; 2454 case BuiltinType::LongDouble: return LongDoubleRank; 2455 } 2456} 2457 2458/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 2459/// point or a complex type (based on typeDomain/typeSize). 2460/// 'typeDomain' is a real floating point or complex type. 2461/// 'typeSize' is a real floating point or complex type. 2462QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 2463 QualType Domain) const { 2464 FloatingRank EltRank = getFloatingRank(Size); 2465 if (Domain->isComplexType()) { 2466 switch (EltRank) { 2467 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2468 case FloatRank: return FloatComplexTy; 2469 case DoubleRank: return DoubleComplexTy; 2470 case LongDoubleRank: return LongDoubleComplexTy; 2471 } 2472 } 2473 2474 assert(Domain->isRealFloatingType() && "Unknown domain!"); 2475 switch (EltRank) { 2476 default: assert(0 && "getFloatingRank(): illegal value for rank"); 2477 case FloatRank: return FloatTy; 2478 case DoubleRank: return DoubleTy; 2479 case LongDoubleRank: return LongDoubleTy; 2480 } 2481} 2482 2483/// getFloatingTypeOrder - Compare the rank of the two specified floating 2484/// point types, ignoring the domain of the type (i.e. 'double' == 2485/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 2486/// LHS < RHS, return -1. 2487int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 2488 FloatingRank LHSR = getFloatingRank(LHS); 2489 FloatingRank RHSR = getFloatingRank(RHS); 2490 2491 if (LHSR == RHSR) 2492 return 0; 2493 if (LHSR > RHSR) 2494 return 1; 2495 return -1; 2496} 2497 2498/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 2499/// routine will assert if passed a built-in type that isn't an integer or enum, 2500/// or if it is not canonicalized. 2501unsigned ASTContext::getIntegerRank(Type *T) { 2502 assert(T->isCanonicalUnqualified() && "T should be canonicalized"); 2503 if (EnumType* ET = dyn_cast<EnumType>(T)) 2504 T = ET->getDecl()->getIntegerType().getTypePtr(); 2505 2506 if (T->isSpecificBuiltinType(BuiltinType::WChar)) 2507 T = getFromTargetType(Target.getWCharType()).getTypePtr(); 2508 2509 if (T->isSpecificBuiltinType(BuiltinType::Char16)) 2510 T = getFromTargetType(Target.getChar16Type()).getTypePtr(); 2511 2512 if (T->isSpecificBuiltinType(BuiltinType::Char32)) 2513 T = getFromTargetType(Target.getChar32Type()).getTypePtr(); 2514 2515 // There are two things which impact the integer rank: the width, and 2516 // the ordering of builtins. The builtin ordering is encoded in the 2517 // bottom three bits; the width is encoded in the bits above that. 2518 if (FixedWidthIntType* FWIT = dyn_cast<FixedWidthIntType>(T)) 2519 return FWIT->getWidth() << 3; 2520 2521 switch (cast<BuiltinType>(T)->getKind()) { 2522 default: assert(0 && "getIntegerRank(): not a built-in integer"); 2523 case BuiltinType::Bool: 2524 return 1 + (getIntWidth(BoolTy) << 3); 2525 case BuiltinType::Char_S: 2526 case BuiltinType::Char_U: 2527 case BuiltinType::SChar: 2528 case BuiltinType::UChar: 2529 return 2 + (getIntWidth(CharTy) << 3); 2530 case BuiltinType::Short: 2531 case BuiltinType::UShort: 2532 return 3 + (getIntWidth(ShortTy) << 3); 2533 case BuiltinType::Int: 2534 case BuiltinType::UInt: 2535 return 4 + (getIntWidth(IntTy) << 3); 2536 case BuiltinType::Long: 2537 case BuiltinType::ULong: 2538 return 5 + (getIntWidth(LongTy) << 3); 2539 case BuiltinType::LongLong: 2540 case BuiltinType::ULongLong: 2541 return 6 + (getIntWidth(LongLongTy) << 3); 2542 case BuiltinType::Int128: 2543 case BuiltinType::UInt128: 2544 return 7 + (getIntWidth(Int128Ty) << 3); 2545 } 2546} 2547 2548/// \brief Whether this is a promotable bitfield reference according 2549/// to C99 6.3.1.1p2, bullet 2 (and GCC extensions). 2550/// 2551/// \returns the type this bit-field will promote to, or NULL if no 2552/// promotion occurs. 2553QualType ASTContext::isPromotableBitField(Expr *E) { 2554 FieldDecl *Field = E->getBitField(); 2555 if (!Field) 2556 return QualType(); 2557 2558 QualType FT = Field->getType(); 2559 2560 llvm::APSInt BitWidthAP = Field->getBitWidth()->EvaluateAsInt(*this); 2561 uint64_t BitWidth = BitWidthAP.getZExtValue(); 2562 uint64_t IntSize = getTypeSize(IntTy); 2563 // GCC extension compatibility: if the bit-field size is less than or equal 2564 // to the size of int, it gets promoted no matter what its type is. 2565 // For instance, unsigned long bf : 4 gets promoted to signed int. 2566 if (BitWidth < IntSize) 2567 return IntTy; 2568 2569 if (BitWidth == IntSize) 2570 return FT->isSignedIntegerType() ? IntTy : UnsignedIntTy; 2571 2572 // Types bigger than int are not subject to promotions, and therefore act 2573 // like the base type. 2574 // FIXME: This doesn't quite match what gcc does, but what gcc does here 2575 // is ridiculous. 2576 return QualType(); 2577} 2578 2579/// getPromotedIntegerType - Returns the type that Promotable will 2580/// promote to: C99 6.3.1.1p2, assuming that Promotable is a promotable 2581/// integer type. 2582QualType ASTContext::getPromotedIntegerType(QualType Promotable) { 2583 assert(!Promotable.isNull()); 2584 assert(Promotable->isPromotableIntegerType()); 2585 if (Promotable->isSignedIntegerType()) 2586 return IntTy; 2587 uint64_t PromotableSize = getTypeSize(Promotable); 2588 uint64_t IntSize = getTypeSize(IntTy); 2589 assert(Promotable->isUnsignedIntegerType() && PromotableSize <= IntSize); 2590 return (PromotableSize != IntSize) ? IntTy : UnsignedIntTy; 2591} 2592 2593/// getIntegerTypeOrder - Returns the highest ranked integer type: 2594/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 2595/// LHS < RHS, return -1. 2596int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 2597 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 2598 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 2599 if (LHSC == RHSC) return 0; 2600 2601 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 2602 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 2603 2604 unsigned LHSRank = getIntegerRank(LHSC); 2605 unsigned RHSRank = getIntegerRank(RHSC); 2606 2607 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 2608 if (LHSRank == RHSRank) return 0; 2609 return LHSRank > RHSRank ? 1 : -1; 2610 } 2611 2612 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 2613 if (LHSUnsigned) { 2614 // If the unsigned [LHS] type is larger, return it. 2615 if (LHSRank >= RHSRank) 2616 return 1; 2617 2618 // If the signed type can represent all values of the unsigned type, it 2619 // wins. Because we are dealing with 2's complement and types that are 2620 // powers of two larger than each other, this is always safe. 2621 return -1; 2622 } 2623 2624 // If the unsigned [RHS] type is larger, return it. 2625 if (RHSRank >= LHSRank) 2626 return -1; 2627 2628 // If the signed type can represent all values of the unsigned type, it 2629 // wins. Because we are dealing with 2's complement and types that are 2630 // powers of two larger than each other, this is always safe. 2631 return 1; 2632} 2633 2634// getCFConstantStringType - Return the type used for constant CFStrings. 2635QualType ASTContext::getCFConstantStringType() { 2636 if (!CFConstantStringTypeDecl) { 2637 CFConstantStringTypeDecl = 2638 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2639 &Idents.get("NSConstantString")); 2640 QualType FieldTypes[4]; 2641 2642 // const int *isa; 2643 FieldTypes[0] = getPointerType(IntTy.withConst()); 2644 // int flags; 2645 FieldTypes[1] = IntTy; 2646 // const char *str; 2647 FieldTypes[2] = getPointerType(CharTy.withConst()); 2648 // long length; 2649 FieldTypes[3] = LongTy; 2650 2651 // Create fields 2652 for (unsigned i = 0; i < 4; ++i) { 2653 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 2654 SourceLocation(), 0, 2655 FieldTypes[i], /*DInfo=*/0, 2656 /*BitWidth=*/0, 2657 /*Mutable=*/false); 2658 CFConstantStringTypeDecl->addDecl(Field); 2659 } 2660 2661 CFConstantStringTypeDecl->completeDefinition(*this); 2662 } 2663 2664 return getTagDeclType(CFConstantStringTypeDecl); 2665} 2666 2667void ASTContext::setCFConstantStringType(QualType T) { 2668 const RecordType *Rec = T->getAs<RecordType>(); 2669 assert(Rec && "Invalid CFConstantStringType"); 2670 CFConstantStringTypeDecl = Rec->getDecl(); 2671} 2672 2673QualType ASTContext::getObjCFastEnumerationStateType() { 2674 if (!ObjCFastEnumerationStateTypeDecl) { 2675 ObjCFastEnumerationStateTypeDecl = 2676 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2677 &Idents.get("__objcFastEnumerationState")); 2678 2679 QualType FieldTypes[] = { 2680 UnsignedLongTy, 2681 getPointerType(ObjCIdTypedefType), 2682 getPointerType(UnsignedLongTy), 2683 getConstantArrayType(UnsignedLongTy, 2684 llvm::APInt(32, 5), ArrayType::Normal, 0) 2685 }; 2686 2687 for (size_t i = 0; i < 4; ++i) { 2688 FieldDecl *Field = FieldDecl::Create(*this, 2689 ObjCFastEnumerationStateTypeDecl, 2690 SourceLocation(), 0, 2691 FieldTypes[i], /*DInfo=*/0, 2692 /*BitWidth=*/0, 2693 /*Mutable=*/false); 2694 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 2695 } 2696 2697 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 2698 } 2699 2700 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 2701} 2702 2703QualType ASTContext::getBlockDescriptorType() { 2704 if (BlockDescriptorType) 2705 return getTagDeclType(BlockDescriptorType); 2706 2707 RecordDecl *T; 2708 // FIXME: Needs the FlagAppleBlock bit. 2709 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2710 &Idents.get("__block_descriptor")); 2711 2712 QualType FieldTypes[] = { 2713 UnsignedLongTy, 2714 UnsignedLongTy, 2715 }; 2716 2717 const char *FieldNames[] = { 2718 "reserved", 2719 "Size" 2720 }; 2721 2722 for (size_t i = 0; i < 2; ++i) { 2723 FieldDecl *Field = FieldDecl::Create(*this, 2724 T, 2725 SourceLocation(), 2726 &Idents.get(FieldNames[i]), 2727 FieldTypes[i], /*DInfo=*/0, 2728 /*BitWidth=*/0, 2729 /*Mutable=*/false); 2730 T->addDecl(Field); 2731 } 2732 2733 T->completeDefinition(*this); 2734 2735 BlockDescriptorType = T; 2736 2737 return getTagDeclType(BlockDescriptorType); 2738} 2739 2740void ASTContext::setBlockDescriptorType(QualType T) { 2741 const RecordType *Rec = T->getAs<RecordType>(); 2742 assert(Rec && "Invalid BlockDescriptorType"); 2743 BlockDescriptorType = Rec->getDecl(); 2744} 2745 2746QualType ASTContext::getBlockDescriptorExtendedType() { 2747 if (BlockDescriptorExtendedType) 2748 return getTagDeclType(BlockDescriptorExtendedType); 2749 2750 RecordDecl *T; 2751 // FIXME: Needs the FlagAppleBlock bit. 2752 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2753 &Idents.get("__block_descriptor_withcopydispose")); 2754 2755 QualType FieldTypes[] = { 2756 UnsignedLongTy, 2757 UnsignedLongTy, 2758 getPointerType(VoidPtrTy), 2759 getPointerType(VoidPtrTy) 2760 }; 2761 2762 const char *FieldNames[] = { 2763 "reserved", 2764 "Size", 2765 "CopyFuncPtr", 2766 "DestroyFuncPtr" 2767 }; 2768 2769 for (size_t i = 0; i < 4; ++i) { 2770 FieldDecl *Field = FieldDecl::Create(*this, 2771 T, 2772 SourceLocation(), 2773 &Idents.get(FieldNames[i]), 2774 FieldTypes[i], /*DInfo=*/0, 2775 /*BitWidth=*/0, 2776 /*Mutable=*/false); 2777 T->addDecl(Field); 2778 } 2779 2780 T->completeDefinition(*this); 2781 2782 BlockDescriptorExtendedType = T; 2783 2784 return getTagDeclType(BlockDescriptorExtendedType); 2785} 2786 2787void ASTContext::setBlockDescriptorExtendedType(QualType T) { 2788 const RecordType *Rec = T->getAs<RecordType>(); 2789 assert(Rec && "Invalid BlockDescriptorType"); 2790 BlockDescriptorExtendedType = Rec->getDecl(); 2791} 2792 2793bool ASTContext::BlockRequiresCopying(QualType Ty) { 2794 if (Ty->isBlockPointerType()) 2795 return true; 2796 if (isObjCNSObjectType(Ty)) 2797 return true; 2798 if (Ty->isObjCObjectPointerType()) 2799 return true; 2800 return false; 2801} 2802 2803QualType ASTContext::BuildByRefType(const char *DeclName, QualType Ty) { 2804 // type = struct __Block_byref_1_X { 2805 // void *__isa; 2806 // struct __Block_byref_1_X *__forwarding; 2807 // unsigned int __flags; 2808 // unsigned int __size; 2809 // void *__copy_helper; // as needed 2810 // void *__destroy_help // as needed 2811 // int X; 2812 // } * 2813 2814 bool HasCopyAndDispose = BlockRequiresCopying(Ty); 2815 2816 // FIXME: Move up 2817 static int UniqueBlockByRefTypeID = 0; 2818 char Name[36]; 2819 sprintf(Name, "__Block_byref_%d_%s", ++UniqueBlockByRefTypeID, DeclName); 2820 RecordDecl *T; 2821 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2822 &Idents.get(Name)); 2823 T->startDefinition(); 2824 QualType Int32Ty = IntTy; 2825 assert(getIntWidth(IntTy) == 32 && "non-32bit int not supported"); 2826 QualType FieldTypes[] = { 2827 getPointerType(VoidPtrTy), 2828 getPointerType(getTagDeclType(T)), 2829 Int32Ty, 2830 Int32Ty, 2831 getPointerType(VoidPtrTy), 2832 getPointerType(VoidPtrTy), 2833 Ty 2834 }; 2835 2836 const char *FieldNames[] = { 2837 "__isa", 2838 "__forwarding", 2839 "__flags", 2840 "__size", 2841 "__copy_helper", 2842 "__destroy_helper", 2843 DeclName, 2844 }; 2845 2846 for (size_t i = 0; i < 7; ++i) { 2847 if (!HasCopyAndDispose && i >=4 && i <= 5) 2848 continue; 2849 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 2850 &Idents.get(FieldNames[i]), 2851 FieldTypes[i], /*DInfo=*/0, 2852 /*BitWidth=*/0, /*Mutable=*/false); 2853 T->addDecl(Field); 2854 } 2855 2856 T->completeDefinition(*this); 2857 2858 return getPointerType(getTagDeclType(T)); 2859} 2860 2861 2862QualType ASTContext::getBlockParmType( 2863 bool BlockHasCopyDispose, 2864 llvm::SmallVector<const Expr *, 8> &BlockDeclRefDecls) { 2865 // FIXME: Move up 2866 static int UniqueBlockParmTypeID = 0; 2867 char Name[36]; 2868 sprintf(Name, "__block_literal_%u", ++UniqueBlockParmTypeID); 2869 RecordDecl *T; 2870 T = RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 2871 &Idents.get(Name)); 2872 QualType FieldTypes[] = { 2873 getPointerType(VoidPtrTy), 2874 IntTy, 2875 IntTy, 2876 getPointerType(VoidPtrTy), 2877 (BlockHasCopyDispose ? 2878 getPointerType(getBlockDescriptorExtendedType()) : 2879 getPointerType(getBlockDescriptorType())) 2880 }; 2881 2882 const char *FieldNames[] = { 2883 "__isa", 2884 "__flags", 2885 "__reserved", 2886 "__FuncPtr", 2887 "__descriptor" 2888 }; 2889 2890 for (size_t i = 0; i < 5; ++i) { 2891 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 2892 &Idents.get(FieldNames[i]), 2893 FieldTypes[i], /*DInfo=*/0, 2894 /*BitWidth=*/0, /*Mutable=*/false); 2895 T->addDecl(Field); 2896 } 2897 2898 for (size_t i = 0; i < BlockDeclRefDecls.size(); ++i) { 2899 const Expr *E = BlockDeclRefDecls[i]; 2900 const BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(E); 2901 clang::IdentifierInfo *Name = 0; 2902 if (BDRE) { 2903 const ValueDecl *D = BDRE->getDecl(); 2904 Name = &Idents.get(D->getName()); 2905 } 2906 QualType FieldType = E->getType(); 2907 2908 if (BDRE && BDRE->isByRef()) 2909 FieldType = BuildByRefType(BDRE->getDecl()->getNameAsCString(), 2910 FieldType); 2911 2912 FieldDecl *Field = FieldDecl::Create(*this, T, SourceLocation(), 2913 Name, FieldType, /*DInfo=*/0, 2914 /*BitWidth=*/0, /*Mutable=*/false); 2915 T->addDecl(Field); 2916 } 2917 2918 T->completeDefinition(*this); 2919 2920 return getPointerType(getTagDeclType(T)); 2921} 2922 2923void ASTContext::setObjCFastEnumerationStateType(QualType T) { 2924 const RecordType *Rec = T->getAs<RecordType>(); 2925 assert(Rec && "Invalid ObjCFAstEnumerationStateType"); 2926 ObjCFastEnumerationStateTypeDecl = Rec->getDecl(); 2927} 2928 2929// This returns true if a type has been typedefed to BOOL: 2930// typedef <type> BOOL; 2931static bool isTypeTypedefedAsBOOL(QualType T) { 2932 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 2933 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 2934 return II->isStr("BOOL"); 2935 2936 return false; 2937} 2938 2939/// getObjCEncodingTypeSize returns size of type for objective-c encoding 2940/// purpose. 2941int ASTContext::getObjCEncodingTypeSize(QualType type) { 2942 uint64_t sz = getTypeSize(type); 2943 2944 // Make all integer and enum types at least as large as an int 2945 if (sz > 0 && type->isIntegralType()) 2946 sz = std::max(sz, getTypeSize(IntTy)); 2947 // Treat arrays as pointers, since that's how they're passed in. 2948 else if (type->isArrayType()) 2949 sz = getTypeSize(VoidPtrTy); 2950 return sz / getTypeSize(CharTy); 2951} 2952 2953/// getObjCEncodingForMethodDecl - Return the encoded type for this method 2954/// declaration. 2955void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 2956 std::string& S) { 2957 // FIXME: This is not very efficient. 2958 // Encode type qualifer, 'in', 'inout', etc. for the return type. 2959 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 2960 // Encode result type. 2961 getObjCEncodingForType(Decl->getResultType(), S); 2962 // Compute size of all parameters. 2963 // Start with computing size of a pointer in number of bytes. 2964 // FIXME: There might(should) be a better way of doing this computation! 2965 SourceLocation Loc; 2966 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 2967 // The first two arguments (self and _cmd) are pointers; account for 2968 // their size. 2969 int ParmOffset = 2 * PtrSize; 2970 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2971 E = Decl->param_end(); PI != E; ++PI) { 2972 QualType PType = (*PI)->getType(); 2973 int sz = getObjCEncodingTypeSize(PType); 2974 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 2975 ParmOffset += sz; 2976 } 2977 S += llvm::utostr(ParmOffset); 2978 S += "@0:"; 2979 S += llvm::utostr(PtrSize); 2980 2981 // Argument types. 2982 ParmOffset = 2 * PtrSize; 2983 for (ObjCMethodDecl::param_iterator PI = Decl->param_begin(), 2984 E = Decl->param_end(); PI != E; ++PI) { 2985 ParmVarDecl *PVDecl = *PI; 2986 QualType PType = PVDecl->getOriginalType(); 2987 if (const ArrayType *AT = 2988 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) { 2989 // Use array's original type only if it has known number of 2990 // elements. 2991 if (!isa<ConstantArrayType>(AT)) 2992 PType = PVDecl->getType(); 2993 } else if (PType->isFunctionType()) 2994 PType = PVDecl->getType(); 2995 // Process argument qualifiers for user supplied arguments; such as, 2996 // 'in', 'inout', etc. 2997 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 2998 getObjCEncodingForType(PType, S); 2999 S += llvm::utostr(ParmOffset); 3000 ParmOffset += getObjCEncodingTypeSize(PType); 3001 } 3002} 3003 3004/// getObjCEncodingForPropertyDecl - Return the encoded type for this 3005/// property declaration. If non-NULL, Container must be either an 3006/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 3007/// NULL when getting encodings for protocol properties. 3008/// Property attributes are stored as a comma-delimited C string. The simple 3009/// attributes readonly and bycopy are encoded as single characters. The 3010/// parametrized attributes, getter=name, setter=name, and ivar=name, are 3011/// encoded as single characters, followed by an identifier. Property types 3012/// are also encoded as a parametrized attribute. The characters used to encode 3013/// these attributes are defined by the following enumeration: 3014/// @code 3015/// enum PropertyAttributes { 3016/// kPropertyReadOnly = 'R', // property is read-only. 3017/// kPropertyBycopy = 'C', // property is a copy of the value last assigned 3018/// kPropertyByref = '&', // property is a reference to the value last assigned 3019/// kPropertyDynamic = 'D', // property is dynamic 3020/// kPropertyGetter = 'G', // followed by getter selector name 3021/// kPropertySetter = 'S', // followed by setter selector name 3022/// kPropertyInstanceVariable = 'V' // followed by instance variable name 3023/// kPropertyType = 't' // followed by old-style type encoding. 3024/// kPropertyWeak = 'W' // 'weak' property 3025/// kPropertyStrong = 'P' // property GC'able 3026/// kPropertyNonAtomic = 'N' // property non-atomic 3027/// }; 3028/// @endcode 3029void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 3030 const Decl *Container, 3031 std::string& S) { 3032 // Collect information from the property implementation decl(s). 3033 bool Dynamic = false; 3034 ObjCPropertyImplDecl *SynthesizePID = 0; 3035 3036 // FIXME: Duplicated code due to poor abstraction. 3037 if (Container) { 3038 if (const ObjCCategoryImplDecl *CID = 3039 dyn_cast<ObjCCategoryImplDecl>(Container)) { 3040 for (ObjCCategoryImplDecl::propimpl_iterator 3041 i = CID->propimpl_begin(), e = CID->propimpl_end(); 3042 i != e; ++i) { 3043 ObjCPropertyImplDecl *PID = *i; 3044 if (PID->getPropertyDecl() == PD) { 3045 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3046 Dynamic = true; 3047 } else { 3048 SynthesizePID = PID; 3049 } 3050 } 3051 } 3052 } else { 3053 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 3054 for (ObjCCategoryImplDecl::propimpl_iterator 3055 i = OID->propimpl_begin(), e = OID->propimpl_end(); 3056 i != e; ++i) { 3057 ObjCPropertyImplDecl *PID = *i; 3058 if (PID->getPropertyDecl() == PD) { 3059 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 3060 Dynamic = true; 3061 } else { 3062 SynthesizePID = PID; 3063 } 3064 } 3065 } 3066 } 3067 } 3068 3069 // FIXME: This is not very efficient. 3070 S = "T"; 3071 3072 // Encode result type. 3073 // GCC has some special rules regarding encoding of properties which 3074 // closely resembles encoding of ivars. 3075 getObjCEncodingForTypeImpl(PD->getType(), S, true, true, 0, 3076 true /* outermost type */, 3077 true /* encoding for property */); 3078 3079 if (PD->isReadOnly()) { 3080 S += ",R"; 3081 } else { 3082 switch (PD->getSetterKind()) { 3083 case ObjCPropertyDecl::Assign: break; 3084 case ObjCPropertyDecl::Copy: S += ",C"; break; 3085 case ObjCPropertyDecl::Retain: S += ",&"; break; 3086 } 3087 } 3088 3089 // It really isn't clear at all what this means, since properties 3090 // are "dynamic by default". 3091 if (Dynamic) 3092 S += ",D"; 3093 3094 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic) 3095 S += ",N"; 3096 3097 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 3098 S += ",G"; 3099 S += PD->getGetterName().getAsString(); 3100 } 3101 3102 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 3103 S += ",S"; 3104 S += PD->getSetterName().getAsString(); 3105 } 3106 3107 if (SynthesizePID) { 3108 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 3109 S += ",V"; 3110 S += OID->getNameAsString(); 3111 } 3112 3113 // FIXME: OBJCGC: weak & strong 3114} 3115 3116/// getLegacyIntegralTypeEncoding - 3117/// Another legacy compatibility encoding: 32-bit longs are encoded as 3118/// 'l' or 'L' , but not always. For typedefs, we need to use 3119/// 'i' or 'I' instead if encoding a struct field, or a pointer! 3120/// 3121void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 3122 if (isa<TypedefType>(PointeeTy.getTypePtr())) { 3123 if (const BuiltinType *BT = PointeeTy->getAs<BuiltinType>()) { 3124 if (BT->getKind() == BuiltinType::ULong && 3125 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3126 PointeeTy = UnsignedIntTy; 3127 else 3128 if (BT->getKind() == BuiltinType::Long && 3129 ((const_cast<ASTContext *>(this))->getIntWidth(PointeeTy) == 32)) 3130 PointeeTy = IntTy; 3131 } 3132 } 3133} 3134 3135void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 3136 const FieldDecl *Field) { 3137 // We follow the behavior of gcc, expanding structures which are 3138 // directly pointed to, and expanding embedded structures. Note that 3139 // these rules are sufficient to prevent recursive encoding of the 3140 // same type. 3141 getObjCEncodingForTypeImpl(T, S, true, true, Field, 3142 true /* outermost type */); 3143} 3144 3145static void EncodeBitField(const ASTContext *Context, std::string& S, 3146 const FieldDecl *FD) { 3147 const Expr *E = FD->getBitWidth(); 3148 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 3149 ASTContext *Ctx = const_cast<ASTContext*>(Context); 3150 unsigned N = E->EvaluateAsInt(*Ctx).getZExtValue(); 3151 S += 'b'; 3152 S += llvm::utostr(N); 3153} 3154 3155// FIXME: Use SmallString for accumulating string. 3156void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 3157 bool ExpandPointedToStructures, 3158 bool ExpandStructures, 3159 const FieldDecl *FD, 3160 bool OutermostType, 3161 bool EncodingProperty) { 3162 if (const BuiltinType *BT = T->getAs<BuiltinType>()) { 3163 if (FD && FD->isBitField()) 3164 return EncodeBitField(this, S, FD); 3165 char encoding; 3166 switch (BT->getKind()) { 3167 default: assert(0 && "Unhandled builtin type kind"); 3168 case BuiltinType::Void: encoding = 'v'; break; 3169 case BuiltinType::Bool: encoding = 'B'; break; 3170 case BuiltinType::Char_U: 3171 case BuiltinType::UChar: encoding = 'C'; break; 3172 case BuiltinType::UShort: encoding = 'S'; break; 3173 case BuiltinType::UInt: encoding = 'I'; break; 3174 case BuiltinType::ULong: 3175 encoding = 3176 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'L' : 'Q'; 3177 break; 3178 case BuiltinType::UInt128: encoding = 'T'; break; 3179 case BuiltinType::ULongLong: encoding = 'Q'; break; 3180 case BuiltinType::Char_S: 3181 case BuiltinType::SChar: encoding = 'c'; break; 3182 case BuiltinType::Short: encoding = 's'; break; 3183 case BuiltinType::Int: encoding = 'i'; break; 3184 case BuiltinType::Long: 3185 encoding = 3186 (const_cast<ASTContext *>(this))->getIntWidth(T) == 32 ? 'l' : 'q'; 3187 break; 3188 case BuiltinType::LongLong: encoding = 'q'; break; 3189 case BuiltinType::Int128: encoding = 't'; break; 3190 case BuiltinType::Float: encoding = 'f'; break; 3191 case BuiltinType::Double: encoding = 'd'; break; 3192 case BuiltinType::LongDouble: encoding = 'd'; break; 3193 } 3194 3195 S += encoding; 3196 return; 3197 } 3198 3199 if (const ComplexType *CT = T->getAs<ComplexType>()) { 3200 S += 'j'; 3201 getObjCEncodingForTypeImpl(CT->getElementType(), S, false, false, 0, false, 3202 false); 3203 return; 3204 } 3205 3206 if (const PointerType *PT = T->getAs<PointerType>()) { 3207 QualType PointeeTy = PT->getPointeeType(); 3208 bool isReadOnly = false; 3209 // For historical/compatibility reasons, the read-only qualifier of the 3210 // pointee gets emitted _before_ the '^'. The read-only qualifier of 3211 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 3212 // Also, do not emit the 'r' for anything but the outermost type! 3213 if (isa<TypedefType>(T.getTypePtr())) { 3214 if (OutermostType && T.isConstQualified()) { 3215 isReadOnly = true; 3216 S += 'r'; 3217 } 3218 } else if (OutermostType) { 3219 QualType P = PointeeTy; 3220 while (P->getAs<PointerType>()) 3221 P = P->getAs<PointerType>()->getPointeeType(); 3222 if (P.isConstQualified()) { 3223 isReadOnly = true; 3224 S += 'r'; 3225 } 3226 } 3227 if (isReadOnly) { 3228 // Another legacy compatibility encoding. Some ObjC qualifier and type 3229 // combinations need to be rearranged. 3230 // Rewrite "in const" from "nr" to "rn" 3231 const char * s = S.c_str(); 3232 int len = S.length(); 3233 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 3234 std::string replace = "rn"; 3235 S.replace(S.end()-2, S.end(), replace); 3236 } 3237 } 3238 if (isObjCSelType(PointeeTy)) { 3239 S += ':'; 3240 return; 3241 } 3242 3243 if (PointeeTy->isCharType()) { 3244 // char pointer types should be encoded as '*' unless it is a 3245 // type that has been typedef'd to 'BOOL'. 3246 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 3247 S += '*'; 3248 return; 3249 } 3250 } else if (const RecordType *RTy = PointeeTy->getAs<RecordType>()) { 3251 // GCC binary compat: Need to convert "struct objc_class *" to "#". 3252 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_class")) { 3253 S += '#'; 3254 return; 3255 } 3256 // GCC binary compat: Need to convert "struct objc_object *" to "@". 3257 if (RTy->getDecl()->getIdentifier() == &Idents.get("objc_object")) { 3258 S += '@'; 3259 return; 3260 } 3261 // fall through... 3262 } 3263 S += '^'; 3264 getLegacyIntegralTypeEncoding(PointeeTy); 3265 3266 getObjCEncodingForTypeImpl(PointeeTy, S, false, ExpandPointedToStructures, 3267 NULL); 3268 return; 3269 } 3270 3271 if (const ArrayType *AT = 3272 // Ignore type qualifiers etc. 3273 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 3274 if (isa<IncompleteArrayType>(AT)) { 3275 // Incomplete arrays are encoded as a pointer to the array element. 3276 S += '^'; 3277 3278 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3279 false, ExpandStructures, FD); 3280 } else { 3281 S += '['; 3282 3283 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 3284 S += llvm::utostr(CAT->getSize().getZExtValue()); 3285 else { 3286 //Variable length arrays are encoded as a regular array with 0 elements. 3287 assert(isa<VariableArrayType>(AT) && "Unknown array type!"); 3288 S += '0'; 3289 } 3290 3291 getObjCEncodingForTypeImpl(AT->getElementType(), S, 3292 false, ExpandStructures, FD); 3293 S += ']'; 3294 } 3295 return; 3296 } 3297 3298 if (T->getAs<FunctionType>()) { 3299 S += '?'; 3300 return; 3301 } 3302 3303 if (const RecordType *RTy = T->getAs<RecordType>()) { 3304 RecordDecl *RDecl = RTy->getDecl(); 3305 S += RDecl->isUnion() ? '(' : '{'; 3306 // Anonymous structures print as '?' 3307 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 3308 S += II->getName(); 3309 } else { 3310 S += '?'; 3311 } 3312 if (ExpandStructures) { 3313 S += '='; 3314 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 3315 FieldEnd = RDecl->field_end(); 3316 Field != FieldEnd; ++Field) { 3317 if (FD) { 3318 S += '"'; 3319 S += Field->getNameAsString(); 3320 S += '"'; 3321 } 3322 3323 // Special case bit-fields. 3324 if (Field->isBitField()) { 3325 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 3326 (*Field)); 3327 } else { 3328 QualType qt = Field->getType(); 3329 getLegacyIntegralTypeEncoding(qt); 3330 getObjCEncodingForTypeImpl(qt, S, false, true, 3331 FD); 3332 } 3333 } 3334 } 3335 S += RDecl->isUnion() ? ')' : '}'; 3336 return; 3337 } 3338 3339 if (T->isEnumeralType()) { 3340 if (FD && FD->isBitField()) 3341 EncodeBitField(this, S, FD); 3342 else 3343 S += 'i'; 3344 return; 3345 } 3346 3347 if (T->isBlockPointerType()) { 3348 S += "@?"; // Unlike a pointer-to-function, which is "^?". 3349 return; 3350 } 3351 3352 if (const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>()) { 3353 // @encode(class_name) 3354 ObjCInterfaceDecl *OI = OIT->getDecl(); 3355 S += '{'; 3356 const IdentifierInfo *II = OI->getIdentifier(); 3357 S += II->getName(); 3358 S += '='; 3359 llvm::SmallVector<FieldDecl*, 32> RecFields; 3360 CollectObjCIvars(OI, RecFields); 3361 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3362 if (RecFields[i]->isBitField()) 3363 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3364 RecFields[i]); 3365 else 3366 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 3367 FD); 3368 } 3369 S += '}'; 3370 return; 3371 } 3372 3373 if (const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>()) { 3374 if (OPT->isObjCIdType()) { 3375 S += '@'; 3376 return; 3377 } 3378 3379 if (OPT->isObjCClassType()) { 3380 S += '#'; 3381 return; 3382 } 3383 3384 if (OPT->isObjCQualifiedIdType()) { 3385 getObjCEncodingForTypeImpl(getObjCIdType(), S, 3386 ExpandPointedToStructures, 3387 ExpandStructures, FD); 3388 if (FD || EncodingProperty) { 3389 // Note that we do extended encoding of protocol qualifer list 3390 // Only when doing ivar or property encoding. 3391 S += '"'; 3392 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3393 E = OPT->qual_end(); I != E; ++I) { 3394 S += '<'; 3395 S += (*I)->getNameAsString(); 3396 S += '>'; 3397 } 3398 S += '"'; 3399 } 3400 return; 3401 } 3402 3403 QualType PointeeTy = OPT->getPointeeType(); 3404 if (!EncodingProperty && 3405 isa<TypedefType>(PointeeTy.getTypePtr())) { 3406 // Another historical/compatibility reason. 3407 // We encode the underlying type which comes out as 3408 // {...}; 3409 S += '^'; 3410 getObjCEncodingForTypeImpl(PointeeTy, S, 3411 false, ExpandPointedToStructures, 3412 NULL); 3413 return; 3414 } 3415 3416 S += '@'; 3417 if (FD || EncodingProperty) { 3418 S += '"'; 3419 S += OPT->getInterfaceDecl()->getNameAsCString(); 3420 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 3421 E = OPT->qual_end(); I != E; ++I) { 3422 S += '<'; 3423 S += (*I)->getNameAsString(); 3424 S += '>'; 3425 } 3426 S += '"'; 3427 } 3428 return; 3429 } 3430 3431 assert(0 && "@encode for type not implemented!"); 3432} 3433 3434void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 3435 std::string& S) const { 3436 if (QT & Decl::OBJC_TQ_In) 3437 S += 'n'; 3438 if (QT & Decl::OBJC_TQ_Inout) 3439 S += 'N'; 3440 if (QT & Decl::OBJC_TQ_Out) 3441 S += 'o'; 3442 if (QT & Decl::OBJC_TQ_Bycopy) 3443 S += 'O'; 3444 if (QT & Decl::OBJC_TQ_Byref) 3445 S += 'R'; 3446 if (QT & Decl::OBJC_TQ_Oneway) 3447 S += 'V'; 3448} 3449 3450void ASTContext::setBuiltinVaListType(QualType T) { 3451 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 3452 3453 BuiltinVaListType = T; 3454} 3455 3456void ASTContext::setObjCIdType(QualType T) { 3457 ObjCIdTypedefType = T; 3458} 3459 3460void ASTContext::setObjCSelType(QualType T) { 3461 ObjCSelType = T; 3462 3463 const TypedefType *TT = T->getAs<TypedefType>(); 3464 if (!TT) 3465 return; 3466 TypedefDecl *TD = TT->getDecl(); 3467 3468 // typedef struct objc_selector *SEL; 3469 const PointerType *ptr = TD->getUnderlyingType()->getAs<PointerType>(); 3470 if (!ptr) 3471 return; 3472 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 3473 if (!rec) 3474 return; 3475 SelStructType = rec; 3476} 3477 3478void ASTContext::setObjCProtoType(QualType QT) { 3479 ObjCProtoType = QT; 3480} 3481 3482void ASTContext::setObjCClassType(QualType T) { 3483 ObjCClassTypedefType = T; 3484} 3485 3486void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 3487 assert(ObjCConstantStringType.isNull() && 3488 "'NSConstantString' type already set!"); 3489 3490 ObjCConstantStringType = getObjCInterfaceType(Decl); 3491} 3492 3493/// \brief Retrieve the template name that represents a qualified 3494/// template name such as \c std::vector. 3495TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3496 bool TemplateKeyword, 3497 TemplateDecl *Template) { 3498 llvm::FoldingSetNodeID ID; 3499 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3500 3501 void *InsertPos = 0; 3502 QualifiedTemplateName *QTN = 3503 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3504 if (!QTN) { 3505 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3506 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3507 } 3508 3509 return TemplateName(QTN); 3510} 3511 3512/// \brief Retrieve the template name that represents a qualified 3513/// template name such as \c std::vector. 3514TemplateName ASTContext::getQualifiedTemplateName(NestedNameSpecifier *NNS, 3515 bool TemplateKeyword, 3516 OverloadedFunctionDecl *Template) { 3517 llvm::FoldingSetNodeID ID; 3518 QualifiedTemplateName::Profile(ID, NNS, TemplateKeyword, Template); 3519 3520 void *InsertPos = 0; 3521 QualifiedTemplateName *QTN = 3522 QualifiedTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3523 if (!QTN) { 3524 QTN = new (*this,4) QualifiedTemplateName(NNS, TemplateKeyword, Template); 3525 QualifiedTemplateNames.InsertNode(QTN, InsertPos); 3526 } 3527 3528 return TemplateName(QTN); 3529} 3530 3531/// \brief Retrieve the template name that represents a dependent 3532/// template name such as \c MetaFun::template apply. 3533TemplateName ASTContext::getDependentTemplateName(NestedNameSpecifier *NNS, 3534 const IdentifierInfo *Name) { 3535 assert((!NNS || NNS->isDependent()) && 3536 "Nested name specifier must be dependent"); 3537 3538 llvm::FoldingSetNodeID ID; 3539 DependentTemplateName::Profile(ID, NNS, Name); 3540 3541 void *InsertPos = 0; 3542 DependentTemplateName *QTN = 3543 DependentTemplateNames.FindNodeOrInsertPos(ID, InsertPos); 3544 3545 if (QTN) 3546 return TemplateName(QTN); 3547 3548 NestedNameSpecifier *CanonNNS = getCanonicalNestedNameSpecifier(NNS); 3549 if (CanonNNS == NNS) { 3550 QTN = new (*this,4) DependentTemplateName(NNS, Name); 3551 } else { 3552 TemplateName Canon = getDependentTemplateName(CanonNNS, Name); 3553 QTN = new (*this,4) DependentTemplateName(NNS, Name, Canon); 3554 } 3555 3556 DependentTemplateNames.InsertNode(QTN, InsertPos); 3557 return TemplateName(QTN); 3558} 3559 3560/// getFromTargetType - Given one of the integer types provided by 3561/// TargetInfo, produce the corresponding type. The unsigned @p Type 3562/// is actually a value of type @c TargetInfo::IntType. 3563QualType ASTContext::getFromTargetType(unsigned Type) const { 3564 switch (Type) { 3565 case TargetInfo::NoInt: return QualType(); 3566 case TargetInfo::SignedShort: return ShortTy; 3567 case TargetInfo::UnsignedShort: return UnsignedShortTy; 3568 case TargetInfo::SignedInt: return IntTy; 3569 case TargetInfo::UnsignedInt: return UnsignedIntTy; 3570 case TargetInfo::SignedLong: return LongTy; 3571 case TargetInfo::UnsignedLong: return UnsignedLongTy; 3572 case TargetInfo::SignedLongLong: return LongLongTy; 3573 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 3574 } 3575 3576 assert(false && "Unhandled TargetInfo::IntType value"); 3577 return QualType(); 3578} 3579 3580//===----------------------------------------------------------------------===// 3581// Type Predicates. 3582//===----------------------------------------------------------------------===// 3583 3584/// isObjCNSObjectType - Return true if this is an NSObject object using 3585/// NSObject attribute on a c-style pointer type. 3586/// FIXME - Make it work directly on types. 3587/// FIXME: Move to Type. 3588/// 3589bool ASTContext::isObjCNSObjectType(QualType Ty) const { 3590 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 3591 if (TypedefDecl *TD = TDT->getDecl()) 3592 if (TD->getAttr<ObjCNSObjectAttr>()) 3593 return true; 3594 } 3595 return false; 3596} 3597 3598/// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 3599/// garbage collection attribute. 3600/// 3601Qualifiers::GC ASTContext::getObjCGCAttrKind(const QualType &Ty) const { 3602 Qualifiers::GC GCAttrs = Qualifiers::GCNone; 3603 if (getLangOptions().ObjC1 && 3604 getLangOptions().getGCMode() != LangOptions::NonGC) { 3605 GCAttrs = Ty.getObjCGCAttr(); 3606 // Default behavious under objective-c's gc is for objective-c pointers 3607 // (or pointers to them) be treated as though they were declared 3608 // as __strong. 3609 if (GCAttrs == Qualifiers::GCNone) { 3610 if (Ty->isObjCObjectPointerType() || Ty->isBlockPointerType()) 3611 GCAttrs = Qualifiers::Strong; 3612 else if (Ty->isPointerType()) 3613 return getObjCGCAttrKind(Ty->getAs<PointerType>()->getPointeeType()); 3614 } 3615 // Non-pointers have none gc'able attribute regardless of the attribute 3616 // set on them. 3617 else if (!Ty->isAnyPointerType() && !Ty->isBlockPointerType()) 3618 return Qualifiers::GCNone; 3619 } 3620 return GCAttrs; 3621} 3622 3623//===----------------------------------------------------------------------===// 3624// Type Compatibility Testing 3625//===----------------------------------------------------------------------===// 3626 3627/// areCompatVectorTypes - Return true if the two specified vector types are 3628/// compatible. 3629static bool areCompatVectorTypes(const VectorType *LHS, 3630 const VectorType *RHS) { 3631 assert(LHS->isCanonicalUnqualified() && RHS->isCanonicalUnqualified()); 3632 return LHS->getElementType() == RHS->getElementType() && 3633 LHS->getNumElements() == RHS->getNumElements(); 3634} 3635 3636//===----------------------------------------------------------------------===// 3637// ObjCQualifiedIdTypesAreCompatible - Compatibility testing for qualified id's. 3638//===----------------------------------------------------------------------===// 3639 3640/// ProtocolCompatibleWithProtocol - return 'true' if 'lProto' is in the 3641/// inheritance hierarchy of 'rProto'. 3642bool ASTContext::ProtocolCompatibleWithProtocol(ObjCProtocolDecl *lProto, 3643 ObjCProtocolDecl *rProto) { 3644 if (lProto == rProto) 3645 return true; 3646 for (ObjCProtocolDecl::protocol_iterator PI = rProto->protocol_begin(), 3647 E = rProto->protocol_end(); PI != E; ++PI) 3648 if (ProtocolCompatibleWithProtocol(lProto, *PI)) 3649 return true; 3650 return false; 3651} 3652 3653/// QualifiedIdConformsQualifiedId - compare id<p,...> with id<p1,...> 3654/// return true if lhs's protocols conform to rhs's protocol; false 3655/// otherwise. 3656bool ASTContext::QualifiedIdConformsQualifiedId(QualType lhs, QualType rhs) { 3657 if (lhs->isObjCQualifiedIdType() && rhs->isObjCQualifiedIdType()) 3658 return ObjCQualifiedIdTypesAreCompatible(lhs, rhs, false); 3659 return false; 3660} 3661 3662/// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an 3663/// ObjCQualifiedIDType. 3664bool ASTContext::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs, 3665 bool compare) { 3666 // Allow id<P..> and an 'id' or void* type in all cases. 3667 if (lhs->isVoidPointerType() || 3668 lhs->isObjCIdType() || lhs->isObjCClassType()) 3669 return true; 3670 else if (rhs->isVoidPointerType() || 3671 rhs->isObjCIdType() || rhs->isObjCClassType()) 3672 return true; 3673 3674 if (const ObjCObjectPointerType *lhsQID = lhs->getAsObjCQualifiedIdType()) { 3675 const ObjCObjectPointerType *rhsOPT = rhs->getAs<ObjCObjectPointerType>(); 3676 3677 if (!rhsOPT) return false; 3678 3679 if (rhsOPT->qual_empty()) { 3680 // If the RHS is a unqualified interface pointer "NSString*", 3681 // make sure we check the class hierarchy. 3682 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3683 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3684 E = lhsQID->qual_end(); I != E; ++I) { 3685 // when comparing an id<P> on lhs with a static type on rhs, 3686 // see if static class implements all of id's protocols, directly or 3687 // through its super class and categories. 3688 if (!rhsID->ClassImplementsProtocol(*I, true)) 3689 return false; 3690 } 3691 } 3692 // If there are no qualifiers and no interface, we have an 'id'. 3693 return true; 3694 } 3695 // Both the right and left sides have qualifiers. 3696 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3697 E = lhsQID->qual_end(); I != E; ++I) { 3698 ObjCProtocolDecl *lhsProto = *I; 3699 bool match = false; 3700 3701 // when comparing an id<P> on lhs with a static type on rhs, 3702 // see if static class implements all of id's protocols, directly or 3703 // through its super class and categories. 3704 for (ObjCObjectPointerType::qual_iterator J = rhsOPT->qual_begin(), 3705 E = rhsOPT->qual_end(); J != E; ++J) { 3706 ObjCProtocolDecl *rhsProto = *J; 3707 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3708 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3709 match = true; 3710 break; 3711 } 3712 } 3713 // If the RHS is a qualified interface pointer "NSString<P>*", 3714 // make sure we check the class hierarchy. 3715 if (ObjCInterfaceDecl *rhsID = rhsOPT->getInterfaceDecl()) { 3716 for (ObjCObjectPointerType::qual_iterator I = lhsQID->qual_begin(), 3717 E = lhsQID->qual_end(); I != E; ++I) { 3718 // when comparing an id<P> on lhs with a static type on rhs, 3719 // see if static class implements all of id's protocols, directly or 3720 // through its super class and categories. 3721 if (rhsID->ClassImplementsProtocol(*I, true)) { 3722 match = true; 3723 break; 3724 } 3725 } 3726 } 3727 if (!match) 3728 return false; 3729 } 3730 3731 return true; 3732 } 3733 3734 const ObjCObjectPointerType *rhsQID = rhs->getAsObjCQualifiedIdType(); 3735 assert(rhsQID && "One of the LHS/RHS should be id<x>"); 3736 3737 if (const ObjCObjectPointerType *lhsOPT = 3738 lhs->getAsObjCInterfacePointerType()) { 3739 if (lhsOPT->qual_empty()) { 3740 bool match = false; 3741 if (ObjCInterfaceDecl *lhsID = lhsOPT->getInterfaceDecl()) { 3742 for (ObjCObjectPointerType::qual_iterator I = rhsQID->qual_begin(), 3743 E = rhsQID->qual_end(); I != E; ++I) { 3744 // when comparing an id<P> on lhs with a static type on rhs, 3745 // see if static class implements all of id's protocols, directly or 3746 // through its super class and categories. 3747 if (lhsID->ClassImplementsProtocol(*I, true)) { 3748 match = true; 3749 break; 3750 } 3751 } 3752 if (!match) 3753 return false; 3754 } 3755 return true; 3756 } 3757 // Both the right and left sides have qualifiers. 3758 for (ObjCObjectPointerType::qual_iterator I = lhsOPT->qual_begin(), 3759 E = lhsOPT->qual_end(); I != E; ++I) { 3760 ObjCProtocolDecl *lhsProto = *I; 3761 bool match = false; 3762 3763 // when comparing an id<P> on lhs with a static type on rhs, 3764 // see if static class implements all of id's protocols, directly or 3765 // through its super class and categories. 3766 for (ObjCObjectPointerType::qual_iterator J = rhsQID->qual_begin(), 3767 E = rhsQID->qual_end(); J != E; ++J) { 3768 ObjCProtocolDecl *rhsProto = *J; 3769 if (ProtocolCompatibleWithProtocol(lhsProto, rhsProto) || 3770 (compare && ProtocolCompatibleWithProtocol(rhsProto, lhsProto))) { 3771 match = true; 3772 break; 3773 } 3774 } 3775 if (!match) 3776 return false; 3777 } 3778 return true; 3779 } 3780 return false; 3781} 3782 3783/// canAssignObjCInterfaces - Return true if the two interface types are 3784/// compatible for assignment from RHS to LHS. This handles validation of any 3785/// protocol qualifiers on the LHS or RHS. 3786/// 3787bool ASTContext::canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, 3788 const ObjCObjectPointerType *RHSOPT) { 3789 // If either type represents the built-in 'id' or 'Class' types, return true. 3790 if (LHSOPT->isObjCBuiltinType() || RHSOPT->isObjCBuiltinType()) 3791 return true; 3792 3793 if (LHSOPT->isObjCQualifiedIdType() || RHSOPT->isObjCQualifiedIdType()) 3794 return ObjCQualifiedIdTypesAreCompatible(QualType(LHSOPT,0), 3795 QualType(RHSOPT,0), 3796 false); 3797 3798 const ObjCInterfaceType* LHS = LHSOPT->getInterfaceType(); 3799 const ObjCInterfaceType* RHS = RHSOPT->getInterfaceType(); 3800 if (LHS && RHS) // We have 2 user-defined types. 3801 return canAssignObjCInterfaces(LHS, RHS); 3802 3803 return false; 3804} 3805 3806bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 3807 const ObjCInterfaceType *RHS) { 3808 // Verify that the base decls are compatible: the RHS must be a subclass of 3809 // the LHS. 3810 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 3811 return false; 3812 3813 // RHS must have a superset of the protocols in the LHS. If the LHS is not 3814 // protocol qualified at all, then we are good. 3815 if (LHS->getNumProtocols() == 0) 3816 return true; 3817 3818 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 3819 // isn't a superset. 3820 if (RHS->getNumProtocols() == 0) 3821 return true; // FIXME: should return false! 3822 3823 for (ObjCInterfaceType::qual_iterator LHSPI = LHS->qual_begin(), 3824 LHSPE = LHS->qual_end(); 3825 LHSPI != LHSPE; LHSPI++) { 3826 bool RHSImplementsProtocol = false; 3827 3828 // If the RHS doesn't implement the protocol on the left, the types 3829 // are incompatible. 3830 for (ObjCInterfaceType::qual_iterator RHSPI = RHS->qual_begin(), 3831 RHSPE = RHS->qual_end(); 3832 RHSPI != RHSPE; RHSPI++) { 3833 if ((*RHSPI)->lookupProtocolNamed((*LHSPI)->getIdentifier())) { 3834 RHSImplementsProtocol = true; 3835 break; 3836 } 3837 } 3838 // FIXME: For better diagnostics, consider passing back the protocol name. 3839 if (!RHSImplementsProtocol) 3840 return false; 3841 } 3842 // The RHS implements all protocols listed on the LHS. 3843 return true; 3844} 3845 3846bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) { 3847 // get the "pointed to" types 3848 const ObjCObjectPointerType *LHSOPT = LHS->getAs<ObjCObjectPointerType>(); 3849 const ObjCObjectPointerType *RHSOPT = RHS->getAs<ObjCObjectPointerType>(); 3850 3851 if (!LHSOPT || !RHSOPT) 3852 return false; 3853 3854 return canAssignObjCInterfaces(LHSOPT, RHSOPT) || 3855 canAssignObjCInterfaces(RHSOPT, LHSOPT); 3856} 3857 3858/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 3859/// both shall have the identically qualified version of a compatible type. 3860/// C99 6.2.7p1: Two types have compatible types if their types are the 3861/// same. See 6.7.[2,3,5] for additional rules. 3862bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 3863 return !mergeTypes(LHS, RHS).isNull(); 3864} 3865 3866QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 3867 const FunctionType *lbase = lhs->getAs<FunctionType>(); 3868 const FunctionType *rbase = rhs->getAs<FunctionType>(); 3869 const FunctionProtoType *lproto = dyn_cast<FunctionProtoType>(lbase); 3870 const FunctionProtoType *rproto = dyn_cast<FunctionProtoType>(rbase); 3871 bool allLTypes = true; 3872 bool allRTypes = true; 3873 3874 // Check return type 3875 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 3876 if (retType.isNull()) return QualType(); 3877 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 3878 allLTypes = false; 3879 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 3880 allRTypes = false; 3881 // FIXME: double check this 3882 bool NoReturn = lbase->getNoReturnAttr() || rbase->getNoReturnAttr(); 3883 if (NoReturn != lbase->getNoReturnAttr()) 3884 allLTypes = false; 3885 if (NoReturn != rbase->getNoReturnAttr()) 3886 allRTypes = false; 3887 3888 if (lproto && rproto) { // two C99 style function prototypes 3889 assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() && 3890 "C++ shouldn't be here"); 3891 unsigned lproto_nargs = lproto->getNumArgs(); 3892 unsigned rproto_nargs = rproto->getNumArgs(); 3893 3894 // Compatible functions must have the same number of arguments 3895 if (lproto_nargs != rproto_nargs) 3896 return QualType(); 3897 3898 // Variadic and non-variadic functions aren't compatible 3899 if (lproto->isVariadic() != rproto->isVariadic()) 3900 return QualType(); 3901 3902 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 3903 return QualType(); 3904 3905 // Check argument compatibility 3906 llvm::SmallVector<QualType, 10> types; 3907 for (unsigned i = 0; i < lproto_nargs; i++) { 3908 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 3909 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 3910 QualType argtype = mergeTypes(largtype, rargtype); 3911 if (argtype.isNull()) return QualType(); 3912 types.push_back(argtype); 3913 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 3914 allLTypes = false; 3915 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 3916 allRTypes = false; 3917 } 3918 if (allLTypes) return lhs; 3919 if (allRTypes) return rhs; 3920 return getFunctionType(retType, types.begin(), types.size(), 3921 lproto->isVariadic(), lproto->getTypeQuals(), 3922 NoReturn); 3923 } 3924 3925 if (lproto) allRTypes = false; 3926 if (rproto) allLTypes = false; 3927 3928 const FunctionProtoType *proto = lproto ? lproto : rproto; 3929 if (proto) { 3930 assert(!proto->hasExceptionSpec() && "C++ shouldn't be here"); 3931 if (proto->isVariadic()) return QualType(); 3932 // Check that the types are compatible with the types that 3933 // would result from default argument promotions (C99 6.7.5.3p15). 3934 // The only types actually affected are promotable integer 3935 // types and floats, which would be passed as a different 3936 // type depending on whether the prototype is visible. 3937 unsigned proto_nargs = proto->getNumArgs(); 3938 for (unsigned i = 0; i < proto_nargs; ++i) { 3939 QualType argTy = proto->getArgType(i); 3940 if (argTy->isPromotableIntegerType() || 3941 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 3942 return QualType(); 3943 } 3944 3945 if (allLTypes) return lhs; 3946 if (allRTypes) return rhs; 3947 return getFunctionType(retType, proto->arg_type_begin(), 3948 proto->getNumArgs(), proto->isVariadic(), 3949 proto->getTypeQuals(), NoReturn); 3950 } 3951 3952 if (allLTypes) return lhs; 3953 if (allRTypes) return rhs; 3954 return getFunctionNoProtoType(retType, NoReturn); 3955} 3956 3957QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 3958 // C++ [expr]: If an expression initially has the type "reference to T", the 3959 // type is adjusted to "T" prior to any further analysis, the expression 3960 // designates the object or function denoted by the reference, and the 3961 // expression is an lvalue unless the reference is an rvalue reference and 3962 // the expression is a function call (possibly inside parentheses). 3963 // FIXME: C++ shouldn't be going through here! The rules are different 3964 // enough that they should be handled separately. 3965 // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really* 3966 // shouldn't be going through here! 3967 if (const ReferenceType *RT = LHS->getAs<ReferenceType>()) 3968 LHS = RT->getPointeeType(); 3969 if (const ReferenceType *RT = RHS->getAs<ReferenceType>()) 3970 RHS = RT->getPointeeType(); 3971 3972 QualType LHSCan = getCanonicalType(LHS), 3973 RHSCan = getCanonicalType(RHS); 3974 3975 // If two types are identical, they are compatible. 3976 if (LHSCan == RHSCan) 3977 return LHS; 3978 3979 // If the qualifiers are different, the types aren't compatible... mostly. 3980 Qualifiers LQuals = LHSCan.getQualifiers(); 3981 Qualifiers RQuals = RHSCan.getQualifiers(); 3982 if (LQuals != RQuals) { 3983 // If any of these qualifiers are different, we have a type 3984 // mismatch. 3985 if (LQuals.getCVRQualifiers() != RQuals.getCVRQualifiers() || 3986 LQuals.getAddressSpace() != RQuals.getAddressSpace()) 3987 return QualType(); 3988 3989 // Exactly one GC qualifier difference is allowed: __strong is 3990 // okay if the other type has no GC qualifier but is an Objective 3991 // C object pointer (i.e. implicitly strong by default). We fix 3992 // this by pretending that the unqualified type was actually 3993 // qualified __strong. 3994 Qualifiers::GC GC_L = LQuals.getObjCGCAttr(); 3995 Qualifiers::GC GC_R = RQuals.getObjCGCAttr(); 3996 assert((GC_L != GC_R) && "unequal qualifier sets had only equal elements"); 3997 3998 if (GC_L == Qualifiers::Weak || GC_R == Qualifiers::Weak) 3999 return QualType(); 4000 4001 if (GC_L == Qualifiers::Strong && RHSCan->isObjCObjectPointerType()) { 4002 return mergeTypes(LHS, getObjCGCQualType(RHS, Qualifiers::Strong)); 4003 } 4004 if (GC_R == Qualifiers::Strong && LHSCan->isObjCObjectPointerType()) { 4005 return mergeTypes(getObjCGCQualType(LHS, Qualifiers::Strong), RHS); 4006 } 4007 return QualType(); 4008 } 4009 4010 // Okay, qualifiers are equal. 4011 4012 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 4013 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 4014 4015 // We want to consider the two function types to be the same for these 4016 // comparisons, just force one to the other. 4017 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 4018 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 4019 4020 // Same as above for arrays 4021 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 4022 LHSClass = Type::ConstantArray; 4023 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 4024 RHSClass = Type::ConstantArray; 4025 4026 // Canonicalize ExtVector -> Vector. 4027 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 4028 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 4029 4030 // If the canonical type classes don't match. 4031 if (LHSClass != RHSClass) { 4032 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 4033 // a signed integer type, or an unsigned integer type. 4034 if (const EnumType* ETy = LHS->getAs<EnumType>()) { 4035 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 4036 return RHS; 4037 } 4038 if (const EnumType* ETy = RHS->getAs<EnumType>()) { 4039 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 4040 return LHS; 4041 } 4042 4043 return QualType(); 4044 } 4045 4046 // The canonical type classes match. 4047 switch (LHSClass) { 4048#define TYPE(Class, Base) 4049#define ABSTRACT_TYPE(Class, Base) 4050#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4051#define DEPENDENT_TYPE(Class, Base) case Type::Class: 4052#include "clang/AST/TypeNodes.def" 4053 assert(false && "Non-canonical and dependent types shouldn't get here"); 4054 return QualType(); 4055 4056 case Type::LValueReference: 4057 case Type::RValueReference: 4058 case Type::MemberPointer: 4059 assert(false && "C++ should never be in mergeTypes"); 4060 return QualType(); 4061 4062 case Type::IncompleteArray: 4063 case Type::VariableArray: 4064 case Type::FunctionProto: 4065 case Type::ExtVector: 4066 assert(false && "Types are eliminated above"); 4067 return QualType(); 4068 4069 case Type::Pointer: 4070 { 4071 // Merge two pointer types, while trying to preserve typedef info 4072 QualType LHSPointee = LHS->getAs<PointerType>()->getPointeeType(); 4073 QualType RHSPointee = RHS->getAs<PointerType>()->getPointeeType(); 4074 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4075 if (ResultType.isNull()) return QualType(); 4076 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4077 return LHS; 4078 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4079 return RHS; 4080 return getPointerType(ResultType); 4081 } 4082 case Type::BlockPointer: 4083 { 4084 // Merge two block pointer types, while trying to preserve typedef info 4085 QualType LHSPointee = LHS->getAs<BlockPointerType>()->getPointeeType(); 4086 QualType RHSPointee = RHS->getAs<BlockPointerType>()->getPointeeType(); 4087 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 4088 if (ResultType.isNull()) return QualType(); 4089 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 4090 return LHS; 4091 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 4092 return RHS; 4093 return getBlockPointerType(ResultType); 4094 } 4095 case Type::ConstantArray: 4096 { 4097 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 4098 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 4099 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 4100 return QualType(); 4101 4102 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 4103 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 4104 QualType ResultType = mergeTypes(LHSElem, RHSElem); 4105 if (ResultType.isNull()) return QualType(); 4106 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4107 return LHS; 4108 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4109 return RHS; 4110 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 4111 ArrayType::ArraySizeModifier(), 0); 4112 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 4113 ArrayType::ArraySizeModifier(), 0); 4114 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 4115 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 4116 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 4117 return LHS; 4118 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 4119 return RHS; 4120 if (LVAT) { 4121 // FIXME: This isn't correct! But tricky to implement because 4122 // the array's size has to be the size of LHS, but the type 4123 // has to be different. 4124 return LHS; 4125 } 4126 if (RVAT) { 4127 // FIXME: This isn't correct! But tricky to implement because 4128 // the array's size has to be the size of RHS, but the type 4129 // has to be different. 4130 return RHS; 4131 } 4132 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 4133 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 4134 return getIncompleteArrayType(ResultType, 4135 ArrayType::ArraySizeModifier(), 0); 4136 } 4137 case Type::FunctionNoProto: 4138 return mergeFunctionTypes(LHS, RHS); 4139 case Type::Record: 4140 case Type::Enum: 4141 return QualType(); 4142 case Type::Builtin: 4143 // Only exactly equal builtin types are compatible, which is tested above. 4144 return QualType(); 4145 case Type::Complex: 4146 // Distinct complex types are incompatible. 4147 return QualType(); 4148 case Type::Vector: 4149 // FIXME: The merged type should be an ExtVector! 4150 if (areCompatVectorTypes(LHS->getAs<VectorType>(), RHS->getAs<VectorType>())) 4151 return LHS; 4152 return QualType(); 4153 case Type::ObjCInterface: { 4154 // Check if the interfaces are assignment compatible. 4155 // FIXME: This should be type compatibility, e.g. whether 4156 // "LHS x; RHS x;" at global scope is legal. 4157 const ObjCInterfaceType* LHSIface = LHS->getAs<ObjCInterfaceType>(); 4158 const ObjCInterfaceType* RHSIface = RHS->getAs<ObjCInterfaceType>(); 4159 if (LHSIface && RHSIface && 4160 canAssignObjCInterfaces(LHSIface, RHSIface)) 4161 return LHS; 4162 4163 return QualType(); 4164 } 4165 case Type::ObjCObjectPointer: { 4166 if (canAssignObjCInterfaces(LHS->getAs<ObjCObjectPointerType>(), 4167 RHS->getAs<ObjCObjectPointerType>())) 4168 return LHS; 4169 4170 return QualType(); 4171 } 4172 case Type::FixedWidthInt: 4173 // Distinct fixed-width integers are not compatible. 4174 return QualType(); 4175 case Type::TemplateSpecialization: 4176 assert(false && "Dependent types have no size"); 4177 break; 4178 } 4179 4180 return QualType(); 4181} 4182 4183//===----------------------------------------------------------------------===// 4184// Integer Predicates 4185//===----------------------------------------------------------------------===// 4186 4187unsigned ASTContext::getIntWidth(QualType T) { 4188 if (T == BoolTy) 4189 return 1; 4190 if (FixedWidthIntType *FWIT = dyn_cast<FixedWidthIntType>(T)) { 4191 return FWIT->getWidth(); 4192 } 4193 // For builtin types, just use the standard type sizing method 4194 return (unsigned)getTypeSize(T); 4195} 4196 4197QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 4198 assert(T->isSignedIntegerType() && "Unexpected type"); 4199 4200 // Turn <4 x signed int> -> <4 x unsigned int> 4201 if (const VectorType *VTy = T->getAs<VectorType>()) 4202 return getVectorType(getCorrespondingUnsignedType(VTy->getElementType()), 4203 VTy->getNumElements()); 4204 4205 // For enums, we return the unsigned version of the base type. 4206 if (const EnumType *ETy = T->getAs<EnumType>()) 4207 T = ETy->getDecl()->getIntegerType(); 4208 4209 const BuiltinType *BTy = T->getAs<BuiltinType>(); 4210 assert(BTy && "Unexpected signed integer type"); 4211 switch (BTy->getKind()) { 4212 case BuiltinType::Char_S: 4213 case BuiltinType::SChar: 4214 return UnsignedCharTy; 4215 case BuiltinType::Short: 4216 return UnsignedShortTy; 4217 case BuiltinType::Int: 4218 return UnsignedIntTy; 4219 case BuiltinType::Long: 4220 return UnsignedLongTy; 4221 case BuiltinType::LongLong: 4222 return UnsignedLongLongTy; 4223 case BuiltinType::Int128: 4224 return UnsignedInt128Ty; 4225 default: 4226 assert(0 && "Unexpected signed integer type"); 4227 return QualType(); 4228 } 4229} 4230 4231ExternalASTSource::~ExternalASTSource() { } 4232 4233void ExternalASTSource::PrintStats() { } 4234 4235 4236//===----------------------------------------------------------------------===// 4237// Builtin Type Computation 4238//===----------------------------------------------------------------------===// 4239 4240/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the 4241/// pointer over the consumed characters. This returns the resultant type. 4242static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 4243 ASTContext::GetBuiltinTypeError &Error, 4244 bool AllowTypeModifiers = true) { 4245 // Modifiers. 4246 int HowLong = 0; 4247 bool Signed = false, Unsigned = false; 4248 4249 // Read the modifiers first. 4250 bool Done = false; 4251 while (!Done) { 4252 switch (*Str++) { 4253 default: Done = true; --Str; break; 4254 case 'S': 4255 assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!"); 4256 assert(!Signed && "Can't use 'S' modifier multiple times!"); 4257 Signed = true; 4258 break; 4259 case 'U': 4260 assert(!Signed && "Can't use both 'S' and 'U' modifiers!"); 4261 assert(!Unsigned && "Can't use 'S' modifier multiple times!"); 4262 Unsigned = true; 4263 break; 4264 case 'L': 4265 assert(HowLong <= 2 && "Can't have LLLL modifier"); 4266 ++HowLong; 4267 break; 4268 } 4269 } 4270 4271 QualType Type; 4272 4273 // Read the base type. 4274 switch (*Str++) { 4275 default: assert(0 && "Unknown builtin type letter!"); 4276 case 'v': 4277 assert(HowLong == 0 && !Signed && !Unsigned && 4278 "Bad modifiers used with 'v'!"); 4279 Type = Context.VoidTy; 4280 break; 4281 case 'f': 4282 assert(HowLong == 0 && !Signed && !Unsigned && 4283 "Bad modifiers used with 'f'!"); 4284 Type = Context.FloatTy; 4285 break; 4286 case 'd': 4287 assert(HowLong < 2 && !Signed && !Unsigned && 4288 "Bad modifiers used with 'd'!"); 4289 if (HowLong) 4290 Type = Context.LongDoubleTy; 4291 else 4292 Type = Context.DoubleTy; 4293 break; 4294 case 's': 4295 assert(HowLong == 0 && "Bad modifiers used with 's'!"); 4296 if (Unsigned) 4297 Type = Context.UnsignedShortTy; 4298 else 4299 Type = Context.ShortTy; 4300 break; 4301 case 'i': 4302 if (HowLong == 3) 4303 Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty; 4304 else if (HowLong == 2) 4305 Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy; 4306 else if (HowLong == 1) 4307 Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy; 4308 else 4309 Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy; 4310 break; 4311 case 'c': 4312 assert(HowLong == 0 && "Bad modifiers used with 'c'!"); 4313 if (Signed) 4314 Type = Context.SignedCharTy; 4315 else if (Unsigned) 4316 Type = Context.UnsignedCharTy; 4317 else 4318 Type = Context.CharTy; 4319 break; 4320 case 'b': // boolean 4321 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!"); 4322 Type = Context.BoolTy; 4323 break; 4324 case 'z': // size_t. 4325 assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!"); 4326 Type = Context.getSizeType(); 4327 break; 4328 case 'F': 4329 Type = Context.getCFConstantStringType(); 4330 break; 4331 case 'a': 4332 Type = Context.getBuiltinVaListType(); 4333 assert(!Type.isNull() && "builtin va list type not initialized!"); 4334 break; 4335 case 'A': 4336 // This is a "reference" to a va_list; however, what exactly 4337 // this means depends on how va_list is defined. There are two 4338 // different kinds of va_list: ones passed by value, and ones 4339 // passed by reference. An example of a by-value va_list is 4340 // x86, where va_list is a char*. An example of by-ref va_list 4341 // is x86-64, where va_list is a __va_list_tag[1]. For x86, 4342 // we want this argument to be a char*&; for x86-64, we want 4343 // it to be a __va_list_tag*. 4344 Type = Context.getBuiltinVaListType(); 4345 assert(!Type.isNull() && "builtin va list type not initialized!"); 4346 if (Type->isArrayType()) { 4347 Type = Context.getArrayDecayedType(Type); 4348 } else { 4349 Type = Context.getLValueReferenceType(Type); 4350 } 4351 break; 4352 case 'V': { 4353 char *End; 4354 unsigned NumElements = strtoul(Str, &End, 10); 4355 assert(End != Str && "Missing vector size"); 4356 4357 Str = End; 4358 4359 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4360 Type = Context.getVectorType(ElementType, NumElements); 4361 break; 4362 } 4363 case 'X': { 4364 QualType ElementType = DecodeTypeFromStr(Str, Context, Error, false); 4365 Type = Context.getComplexType(ElementType); 4366 break; 4367 } 4368 case 'P': 4369 Type = Context.getFILEType(); 4370 if (Type.isNull()) { 4371 Error = ASTContext::GE_Missing_stdio; 4372 return QualType(); 4373 } 4374 break; 4375 case 'J': 4376 if (Signed) 4377 Type = Context.getsigjmp_bufType(); 4378 else 4379 Type = Context.getjmp_bufType(); 4380 4381 if (Type.isNull()) { 4382 Error = ASTContext::GE_Missing_setjmp; 4383 return QualType(); 4384 } 4385 break; 4386 } 4387 4388 if (!AllowTypeModifiers) 4389 return Type; 4390 4391 Done = false; 4392 while (!Done) { 4393 switch (*Str++) { 4394 default: Done = true; --Str; break; 4395 case '*': 4396 Type = Context.getPointerType(Type); 4397 break; 4398 case '&': 4399 Type = Context.getLValueReferenceType(Type); 4400 break; 4401 // FIXME: There's no way to have a built-in with an rvalue ref arg. 4402 case 'C': 4403 Type = Type.withConst(); 4404 break; 4405 } 4406 } 4407 4408 return Type; 4409} 4410 4411/// GetBuiltinType - Return the type for the specified builtin. 4412QualType ASTContext::GetBuiltinType(unsigned id, 4413 GetBuiltinTypeError &Error) { 4414 const char *TypeStr = BuiltinInfo.GetTypeString(id); 4415 4416 llvm::SmallVector<QualType, 8> ArgTypes; 4417 4418 Error = GE_None; 4419 QualType ResType = DecodeTypeFromStr(TypeStr, *this, Error); 4420 if (Error != GE_None) 4421 return QualType(); 4422 while (TypeStr[0] && TypeStr[0] != '.') { 4423 QualType Ty = DecodeTypeFromStr(TypeStr, *this, Error); 4424 if (Error != GE_None) 4425 return QualType(); 4426 4427 // Do array -> pointer decay. The builtin should use the decayed type. 4428 if (Ty->isArrayType()) 4429 Ty = getArrayDecayedType(Ty); 4430 4431 ArgTypes.push_back(Ty); 4432 } 4433 4434 assert((TypeStr[0] != '.' || TypeStr[1] == 0) && 4435 "'.' should only occur at end of builtin type list!"); 4436 4437 // handle untyped/variadic arguments "T c99Style();" or "T cppStyle(...);". 4438 if (ArgTypes.size() == 0 && TypeStr[0] == '.') 4439 return getFunctionNoProtoType(ResType); 4440 return getFunctionType(ResType, ArgTypes.data(), ArgTypes.size(), 4441 TypeStr[0] == '.', 0); 4442} 4443 4444QualType 4445ASTContext::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 4446 // Perform the usual unary conversions. We do this early so that 4447 // integral promotions to "int" can allow us to exit early, in the 4448 // lhs == rhs check. Also, for conversion purposes, we ignore any 4449 // qualifiers. For example, "const float" and "float" are 4450 // equivalent. 4451 if (lhs->isPromotableIntegerType()) 4452 lhs = getPromotedIntegerType(lhs); 4453 else 4454 lhs = lhs.getUnqualifiedType(); 4455 if (rhs->isPromotableIntegerType()) 4456 rhs = getPromotedIntegerType(rhs); 4457 else 4458 rhs = rhs.getUnqualifiedType(); 4459 4460 // If both types are identical, no conversion is needed. 4461 if (lhs == rhs) 4462 return lhs; 4463 4464 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 4465 // The caller can deal with this (e.g. pointer + int). 4466 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 4467 return lhs; 4468 4469 // At this point, we have two different arithmetic types. 4470 4471 // Handle complex types first (C99 6.3.1.8p1). 4472 if (lhs->isComplexType() || rhs->isComplexType()) { 4473 // if we have an integer operand, the result is the complex type. 4474 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 4475 // convert the rhs to the lhs complex type. 4476 return lhs; 4477 } 4478 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 4479 // convert the lhs to the rhs complex type. 4480 return rhs; 4481 } 4482 // This handles complex/complex, complex/float, or float/complex. 4483 // When both operands are complex, the shorter operand is converted to the 4484 // type of the longer, and that is the type of the result. This corresponds 4485 // to what is done when combining two real floating-point operands. 4486 // The fun begins when size promotion occur across type domains. 4487 // From H&S 6.3.4: When one operand is complex and the other is a real 4488 // floating-point type, the less precise type is converted, within it's 4489 // real or complex domain, to the precision of the other type. For example, 4490 // when combining a "long double" with a "double _Complex", the 4491 // "double _Complex" is promoted to "long double _Complex". 4492 int result = getFloatingTypeOrder(lhs, rhs); 4493 4494 if (result > 0) { // The left side is bigger, convert rhs. 4495 rhs = getFloatingTypeOfSizeWithinDomain(lhs, rhs); 4496 } else if (result < 0) { // The right side is bigger, convert lhs. 4497 lhs = getFloatingTypeOfSizeWithinDomain(rhs, lhs); 4498 } 4499 // At this point, lhs and rhs have the same rank/size. Now, make sure the 4500 // domains match. This is a requirement for our implementation, C99 4501 // does not require this promotion. 4502 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 4503 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 4504 return rhs; 4505 } else { // handle "_Complex double, double". 4506 return lhs; 4507 } 4508 } 4509 return lhs; // The domain/size match exactly. 4510 } 4511 // Now handle "real" floating types (i.e. float, double, long double). 4512 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 4513 // if we have an integer operand, the result is the real floating type. 4514 if (rhs->isIntegerType()) { 4515 // convert rhs to the lhs floating point type. 4516 return lhs; 4517 } 4518 if (rhs->isComplexIntegerType()) { 4519 // convert rhs to the complex floating point type. 4520 return getComplexType(lhs); 4521 } 4522 if (lhs->isIntegerType()) { 4523 // convert lhs to the rhs floating point type. 4524 return rhs; 4525 } 4526 if (lhs->isComplexIntegerType()) { 4527 // convert lhs to the complex floating point type. 4528 return getComplexType(rhs); 4529 } 4530 // We have two real floating types, float/complex combos were handled above. 4531 // Convert the smaller operand to the bigger result. 4532 int result = getFloatingTypeOrder(lhs, rhs); 4533 if (result > 0) // convert the rhs 4534 return lhs; 4535 assert(result < 0 && "illegal float comparison"); 4536 return rhs; // convert the lhs 4537 } 4538 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 4539 // Handle GCC complex int extension. 4540 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 4541 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 4542 4543 if (lhsComplexInt && rhsComplexInt) { 4544 if (getIntegerTypeOrder(lhsComplexInt->getElementType(), 4545 rhsComplexInt->getElementType()) >= 0) 4546 return lhs; // convert the rhs 4547 return rhs; 4548 } else if (lhsComplexInt && rhs->isIntegerType()) { 4549 // convert the rhs to the lhs complex type. 4550 return lhs; 4551 } else if (rhsComplexInt && lhs->isIntegerType()) { 4552 // convert the lhs to the rhs complex type. 4553 return rhs; 4554 } 4555 } 4556 // Finally, we have two differing integer types. 4557 // The rules for this case are in C99 6.3.1.8 4558 int compare = getIntegerTypeOrder(lhs, rhs); 4559 bool lhsSigned = lhs->isSignedIntegerType(), 4560 rhsSigned = rhs->isSignedIntegerType(); 4561 QualType destType; 4562 if (lhsSigned == rhsSigned) { 4563 // Same signedness; use the higher-ranked type 4564 destType = compare >= 0 ? lhs : rhs; 4565 } else if (compare != (lhsSigned ? 1 : -1)) { 4566 // The unsigned type has greater than or equal rank to the 4567 // signed type, so use the unsigned type 4568 destType = lhsSigned ? rhs : lhs; 4569 } else if (getIntWidth(lhs) != getIntWidth(rhs)) { 4570 // The two types are different widths; if we are here, that 4571 // means the signed type is larger than the unsigned type, so 4572 // use the signed type. 4573 destType = lhsSigned ? lhs : rhs; 4574 } else { 4575 // The signed type is higher-ranked than the unsigned type, 4576 // but isn't actually any bigger (like unsigned int and long 4577 // on most 32-bit systems). Use the unsigned type corresponding 4578 // to the signed type. 4579 destType = getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 4580 } 4581 return destType; 4582} 4583